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Author SHA1 Message Date
Erik
23aa62f292 fix(review): close the C5b architecture-review findings (D2/D3/D4, L1-L5, S1)
Follow-up to C5b (735f0a72). The retail-conformance review passed, so no
production behaviour line moved: the flag truth table and the
refreshPosition:false withhold are untouched. This is blast radius, test
discrimination and documentation fidelity - plus two findings I could not
confirm and am rebutting rather than complying with.

D3 - THE PUBLISH-CONSERVATION TEST DID NOT DISCRIMINATE. The reviewer was
right and it was the worst finding here: proof obligation 3's test passed
identically with C5b reverted. Its only delta assertion FILTERED
(Assert.Single(deltas, Rebucketed && parentGuid)), so the pre-C5b stream
[Rebucketed] and the post-C5b stream [Updated, Rebucketed] both satisfied
it, and childSpatialBefore+1 held in both worlds because whichever site did
not move the cell propagated idempotently. It now asserts the complete
ordered parent stream plus each element's CellId and Position.ObjCellId.
Sabotage: restoring refreshPosition:acceptedPosition turns it red (it was
green before), together with the withhold test and the new L5 test.

That cardinality change was itself unfiled and is now AP-147: a
cell-changing accepted Position publishes TWO entity deltas where it
published one, and the intermediate Updated pairs the OLD CellId with the
NEW wire Position - a torn pair that did not exist pre-C5b, since both
halves used to move inside one publish. No production consumer reads a
delta's paired fields, but a recorder/plugin/bot event log would capture
it. The row states why suppressing the Updated is not available at that
layer (the merge cannot know whether its caller reaches W2).

D4 - THE PROJECTILE DOC COMMENT WAS FALSE AND ITS RETAIL ARGUMENT WAS
INVERTED. SyncPresentationFromResolvedBody claimed record.FullCellId is
"the WIRE cell ... stamped by the merge's RefreshDerivedState/SetFullCell,
before classification ever runs" and argued from retail's store_position
@0x00515CE2 that the destination cell is the right one. C5b falsified the
premise; the missile arm also returns before W2, so nothing stamps the wire
cell for a projectile at all. Rewritten. The honest conclusion, which the
old text would have called wrong: on a stored outcome presentation now
pairs the DESTINATION world position with the SOURCE cell. That is not a
choice this method can make differently - StoreAcceptedDestinationPose
writes only Position/Orientation, so record.FullCellId and
body.CellPosition.ObjCellId now hold the same source cell and reading
either yields the same value. The divergence is AP-138 item (1)'s
store-writes-pose-but-not-cell residual, retiring via #309, not a field
choice here. Projecting the wire cell instead would invent a residency the
placement declined - the AP-1 shape C5b closed.

L3/L4/L5 - PINNING GAPS, ALL THREE CONFIRMED AND CLOSED.
L3: the matrix's oracle passed HasAnimations as a literal, so the merge's
old.MotionTableId ?? old.Physics?.MotionTableId and
RuntimeAcceptedPositionRouteRequests.Build's canonical-snapshot twin were
textually identical and pinned by nothing. The oracle is now BUILT by the
production constructor.
L4: every fixture set both MotionTableId halves to the same value, so
deleting either operand of the ?? was undetectable while the production
comment said the mixed case is the real-world one. Six mixed rows added,
including the explicit-zero row (a present-but-zero top half is not null,
so ?? never reaches the physics half).
L5: the retained Rebucketed ternary had zero coverage through
TryApplyPosition - every restoreCancelledPark test called Forget directly.
Now driven through the real merge, with the wire cell deliberately the
SOURCE while the park's committed body cell is the DESTINATION, so the
restored residency can only have come from the rollback.
Sabotage (each red, each restored): merge ?? -> top half only, 1 red;
-> physics half only, 2 red; Build's ?? -> physics half only, 2 red;
ternary -> constant Updated, exactly the L5 test red.

L1/L2 - THE MISSING TEST IS ADDED; THE DEFECT IS NOT THERE. The reviewer
was right that C5b's "no fixture covers pickup at that layer" was
inaccurate - LiveEntityNetworkOnPositionCollapseMatrixTests drives the real
OnPosition at ~26 sites - and the end-to-end test is added: withdraw ->
accepted Position -> IsSpatiallyProjected && FullCellId == wireCell, both
guid classes.

But ChildUnparentDisposition.Pending is NOT a live defect, because it is
production-unreachable. The sole production _withdrawProjection binding
(LivePresentationComposition.cs:599) is
LiveEntityProjectionWithdrawalController.WithdrawExact, whose only Pending
mint is inside its catch block and therefore always carries a non-null
Failure - and AdvanceUnparentTransition rethrows at
EquippedChildRenderController.cs:1307 BEFORE the return Pending at :1309.
The named drop scenario does not reach it anyway (BeginDetachedRemoval has
already emptied the capture list) and would be correct if it did: a
previously-equipped child is LegacyImmediate, so the FullCellId != 0u gate
at DatLiveEntityProjectionMaterializer.cs:767 is never consulted and
re-projection uses the wire cell at LiveEntityRuntime.cs:824.

Measured while building that test, and NOT what C5b assumed: W2 and W3 are
REDUNDANT on the remote tail. Sabotaging W2 alone - adopting the committed
cell instead of the wire cell, OR skipping the rebucket outright - leaves
the whole file green, because W3's RemoteMotion.CellId write reads through
to canonical FullCellId via CommitCanonicalCell, whose CellCommitted
recovery re-installs the bucket. Only removing BOTH goes red, and then the
new test is the only red in the file. So it is named for what it pins, and
AD-60 is amended with the measurement: neither channel is individually
load-bearing, so a future retirement of one is caught by nothing else.

D2 - REBUTTED, WITH THE REAL GAP FILED INSTEAD. The reviewer's hypothesis
was that TryApplyInitialCreateCompletionPresentation's staleness guard lost
its ability to detect an intervening steady-state Position when C5b stopped
the merge stamping the wire cell, and asked for a PositionAuthorityVersion
term. I do not think that is right and did not add it.

The receipt's facts are the canonical BODY's pose and cell at publish
(PublishExecutorCompletion builds both from the record). Exactly two owners
can move them: a Runtime SetPosition commit/withdrawal, every one of which
calls AdvancePlacementCommit - the only caller family is
RuntimeSetPositionState - and a rebucket, which moves FullCellId. Both are
already covered by the two existing terms. An accepted steady-state
Position is neither, and C5b did not make it one: the merge refreshes the
snapshot and advances PositionAuthorityVersion but never wrote the body,
and the App generic tail writes the RENDER entity. The wire-cell half stays
covered because W2/W3 commit it in the same call; the paths that return
before them leave the record at the last committed cell, which IS the
receipt's own cell - correctly not a supersession.

Adding the term would decline receipts whose facts are still true, on the
entity's FIRST world-visible moment: the pose write and
RebucketLiveEntityPresentationOnly would be skipped while TryPublishPlace
still publishes, so a packet returning before the render write would leave
the sidecar visible at its materialized pose in a wrong bucket. That is the
handoff's own "removed the invariant failure while leaving the bug" shape.

There IS one supersession neither term covers, and it predates C5b:
RuntimeRemotePlacementDriveController.StoreAcceptedDestinationPose writes
body.Position/Orientation on the far-snap Refused/Contention arm with no
placement commit and no cell move. Filed as #323 with the FIFO-blocking
argument for why a receipt can still be pending when it lands, an explicit
"not established as reachable", and an explicit "do not fix it with
PositionAuthorityVersion". The guard's comment now carries the whole
argument instead of one sentence.

S1 - DANGLING POINTER CLOSED. InboundPhysicsStateController.cs:610 still
said the two-callers-one-rule debt was "tracked for the eventual cutover
unification ... See docs/ISSUES.md", which pointed at nothing after C5b
closed #275 without a successor. Filed #322, cited from both the comment
and #275's closure, including why widening TryApplyPosition's signature to
take a route would be the wrong unification.

AP-138 amended: C5b staled its round-3 measurement that "both
accepted-Position callers commit the accepted wire cell to
record.FullCellId before submitting". Route 2 submits from
TryExecuteAcceptedLocalPosition ahead of W2, so on a first submit
PlacementTouchesPrefix's CurrentCellId arm now names the SOURCE landblock,
not the destination. Confined to which prefix the quiescence pre-flight
matches, which that row already established is not the correctness
mechanism.

GATES. Release build 0 errors. Complete suite 11,134 passed / 4 skipped /
0 failed, from the 11,125 / 4 baseline at ed806997: net +9, all new tests,
no test deleted or weakened, no new skip. Runtime.Tests 1195 -> 1202 (+6
mixed-motion-table rows, +1 park-rollback fact); App.Tests 4132 -> 4134
(+2 guid rows). None of #302/#308/#321 appeared. Not connected-gated -
nothing here changes runtime behaviour.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-08-05 22:08:46 +02:00
Erik
735f0a72af fix(physics): classify before merge on every steady-state Position (C5b, #275, AP-131/AD-60)
The steady-state accepted-Position merge did two things retail never does,
on every single Position packet: it installed the wire placement frame and
unparented unconditionally, and it derived the record's FullCellId from
bare wire acceptance. Both are now correct, and they land together - a
half-flipped intermediate (classified flags with the wire stamp, or vice
versa) is exactly the mixed-residency state this campaign keeps paying for.

WHY the flags need no route. SmartBox::HandleReceivedPosition @0x00453FD0
decides both pre-placement writes BEFORE MoveOrTeleport is consulted: Gate A
@0x0045400C returns @0x0045409D ahead of unset_parent @0x00454129 and ahead
of the HasAnims SetPlacementFrame gate @0x00454137. Neither gate reads the
near/far/teleport classification. So the two flags are a pure function of
(disposition, hasAnimations) and are computable inside the merge, pre-merge,
with no signature change, no route construction and no playerDistance - the
scoping's ~150-400-line route-plumbing estimate over-counted because it did
not see this. That truth table IS
RuntimeAuthoritativePositionRouteClassifier.ClassifyAcceptedPosition's own
ApplyPlacementFrameBeforeRouting/UnparentBeforeRouting rows; the classifier
stays the oracle and the equality is pinned by test, not by a shared path,
so each computation remains separately sabotage-verifiable.

WHY the cell is withheld. HandleReceivedPosition reads the wire objcell_id
into a LOCAL @0x00453FE3 and hands it only to BlipPlayer / TeleportPlayer /
MoveOrTeleport / ConstrainTo; it never assigns the object's cell. The
object's cell moves inside the placement family (SetPositionInternal
@0x00515BD0 to set_cell, enter_world) or per-frame transit, and nowhere
else. The continuation executor has encoded that rule since the executor
slice; this caller now matches it verbatim.

WHAT DELIBERATELY SURVIVES. Two steady-state wire-cell writers stay,
downstream of the merge and outside the classification window: the
OnPosition prologue rebucket (W2, into CommitRebucket), which is also the
local player's own cell-freshness path, and the post-routing wire-cell adopt
for non-placing arms (W3, AP-135). Gating W2 "for symmetry" would freeze the
player's canonical cell between teleports and #319's child-cell equality
would inherit the freeze. AD-60's rewrite names both so the retirement
cannot be misread as "wire acceptance never changes residency anywhere".

REGISTER. AP-131 RETIRED - the unconditional literals no longer exist; the
caller was corrected, not deleted, so the row's own "deleted at the
production cutover" framing is overtaken. AD-60's legacy half RETIRED and
the row REWRITTEN rather than deleted, naming W2/W3 (route 4b-3's D8
precedent: a silent whole-row deletion would hide surviving channels).
AP-130 amended - the merge consumes the same static HasAnimations proxy,
deliberately not escalated to a live animation-queue read. AP-146 and #320
amended - their "accepted inbound Position (RefreshSnapshot into
RuntimeEntityRecord.cs:234)" local-player cell writer is now the generic
tail's CommitRebucket, and a ForcePosition (which returns before that tail)
is placement-receipt-authoritative. #275 closed.

HEADLINE BEHAVIOURAL DELTA, stated once: a refused or contended local
ForcePosition now leaves FullCellId at the last committed cell where the
merge used to stamp the refused packet's wire cell. Retail cannot refuse
(AD-62) and its body keeps its last placed cell, so the new shape is the
retail-reachable one.

THREE CONSUMER SITES THE CONTRACT'S BLAST-RADIUS SURVEY MISSED, all
D2-caused, all found by the suite rather than by reading, all intended
semantics rather than regressions (recorded in the contract's new section
14):
(1) DatLiveEntityProjectionMaterializer's self-projection branch reads
    FullCellId inside OnPosition's prologue recovery, ahead of W2. It now
    correctly declines to project from an unplaced wire claim; production
    installs the bucket at W2 in the same call (verified: no return between
    the recovery call and W2 is conditioned on IsSpatiallyProjected or
    FullCellId). Two hydration tests asserted the bucket at the recovery
    boundary and now drive the production W2 step - the same shape as trap
    T2, one layer up.
(2) ProjectileController.SyncPresentationFromResolvedBody writes
    ParentCellId = record.FullCellId. On a refused missile placement that is
    now the committed source cell. The MAJOR-1 invariant is unchanged and is
    now asserted as the identity it always meant rather than as a wire-cell
    constant.
(3) The merge's Rebucketed ternary does NOT become always-Updated as the
    contract predicted, and is deliberately kept: the
    Forget(restoreCancelledPark: true) above it can roll a wakeable
    lost-cell park back, and RestoreParkWithdrawal restores canonical
    residency. That is a real cell edge produced inside this method by a
    placement owner.

TEST-COUNT RECONCILIATION. Baseline measured at this HEAD by stashing the
change: Runtime.Tests 1176, App.Tests 4135 (4132 passed / 3 skipped),
solution 11,106 passed / 4 skipped - matching the recorded figure at
6921a027 exactly. Post-change: Runtime.Tests 1195, App.Tests 4135 unchanged,
solution 11,125 passed / 4 skipped / 0 failed. Net +19, entirely new Runtime
tests: 3 facts plus a 12-row matrix theory in
InboundPhysicsStateControllerTests, 1 fact plus a 2-row theory in the new
RuntimeSteadyStatePositionMergeTests, and 1 fact in
RuntimeAcceptedPositionDriveControllerTests. No test was deleted; five
existing tests were rewritten in place, never delete-only. No new skip; none
of #302/#308/#321 appeared.

SABOTAGE VERIFICATIONS (each new discriminating test, both directions;
production line broken, suite run, line restored):
  installPlacementFrame (!force && !hasAnimations) to (!force)
    5 fail: ApplyOnAnimatedEntity_NeverInstallsTheWirePlacementFrame plus
    the 4 animated non-force matrix rows.
  installPlacementFrame to false
    6 fail: ApplyOnNonAnimatedEntity_InstallsTheWirePlacementFrame,
    PositionPlacementAbsentAndPresentZeroBothApplyRetailZero plus the 4
    non-animated non-force matrix rows.
  clearParent (!force) to true
    3 fail: ForcePositionOnParentedLocalPlayer_RetainsTheParentAttachment
    plus the 2 force+parented matrix rows.
  clearParent (!force) to false
    4 fail: the 4 Apply+parented matrix rows.
  refreshPosition false to acceptedPosition
    4 fail: AcceptedPosition_WithholdsTheWireCellAtTheMergeBoundary,
    ContendedForcePosition_WritesNoResidencyAnywhere,
    ReentrantNewerPositionDuringPickupDiscardSuppressesStalePickupDelta,
    MissileFarRefused_...ParentCellIdAgreesWithCommittedCell. Confirmed a
    second time by the baseline measurement above, where the withhold test
    was the sole red.
  CommitRebucket publishes Updated instead of Rebucketed
    2 fail: both parent classes of
    CellChangingAcceptedPosition_ConservesOneRebucketAndOneChildPropagation.
  RuntimeEntityDirectory.SetFullCell drops PropagateFullCellToChildren
    2 fail: the same two rows.
T4 respected: the ForcePosition placement-frame half is inert
(appliedPlacement keeps old.PlacementId under either flag value), so the
force row's discriminating assertion is parent retention, never the frame.

NOT DONE, deliberately: the executor is still not wired into the
steady-state path (#275's alternative branch); W2/W3 are untouched; no probe
added or stripped; AP-130's proxy not escalated; no while-here unification
of the two merge callsites. No automated OnPosition-level test drives the
full pickup / drop / reproject sequence (no fixture covers pickup at that
layer); the contract's connected gate recipe item 1 is the positive evidence
for it and has NOT been run - this commit is not connected-gated.

Contract: docs/research/2026-08-05-c5b-contract.md (committed here, with its
section 14 implementation outcome appended).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-08-05 21:17:44 +02:00
Erik
36255af0f6 fix(physics): C4 route 5 — projectile authoritative placement (#276 partial)
Ports retail's missile Position handling into the canonical Runtime
placement owner instead of the deleted ApplyAuthoritativePosition
short-circuit. The Create/residence-window halves of the projectile
pipeline (RuntimeProjectile binding, TryBind's adopted-body branch,
the collision/shadow registration) were already canonical from prior
slices; this closes the remaining gap — how an ACCEPTED Position for
an in-flight missile is classified, placed, and presented.

Byte-decode (Step 1 hard gate, before any code was written):
CPhysicsObj::MoveOrTeleport @0x00516330-0x00516438 disassembled from
the PDB-paired binary (Capstone, x86 32-bit thiscall). `ret 0x10`
establishes four stack args; [esp+0x7c] (arg5, the velocity pointer)
is never referenced in any of the three branches (teleport/near/far).
The retail reviewer independently reproduced this by searching the
whole function body for the `24 7c` mod/rm+disp8 encoding a
`[esp+0x7c]` read would require and found zero occurrences. This
retired a fabricated `?? Vector3.Zero` fallback in the deleted method
— retail's PositionPack::UnPack initializes an absent velocity to
zero and MoveOrTeleport never installs it; the projectile's Vector
channel (RuntimeProjectilePhysicsUpdater.ApplyAuthoritativeVector)
remains the sole velocity authority for a missile. D-P5 in the
contract; the Runtime seam commits no velocity from the Position
packet at all.

The unbound-missile fix: RuntimeEntityObjectLifetime's
ClassifyRemoteAcceptedPosition now derives ProjectileAuthoritative
from a CONJUNCTIVE predicate — the Missile bit AND a bound
RuntimeProjectile whose Body is the canonical PhysicsBody — never the
bit alone. Retail places every non-player CPhysicsObj unconditionally
(there is no missile-specific placement gate in MoveOrTeleport or its
callers), so an unbindable or not-yet-bound missile taking the
ordinary remote tail is retail-faithful, not a fallback: the earlier
bit-only discriminator would have silently frozen it instead.

AP-141 records this as a deliberate, recorded divergence, not
fidelity. Retail mechanically WOULD arm a missile's ConstrainTo leash
on any nonzero MoveOrTeleport return: HandleReceivedPosition
@0x00453FD0's only kind test is player-vs-not, ConstrainTo
@0x00454272 has no kind test of its own, and CPhysicsObj::ConstrainTo
@0x00510520 creates a PositionManager on demand via
MakePositionManager @0x00510523 if one doesn't exist. acdream
deliberately does not construct that EntityPhysicsHost/
PositionManager/InterpolationManager chain for a ballistic body — the
route-5b split the C4 route 5 contract rejected — so a live missile
never shows an armed leash and never catches up via the near/
UnroutedCatchUp policy. This divergence is safe specifically because
ACE never sends UpdatePosition for a missile
(references/ACE/Source/ACE.Server/WorldObjects/WorldObject_Tick.cs:
333-334, SendUpdatePosition() commented out inside the
PhysicsState.Missile branch at :265) — every half of this row is
deterministic-test-gated only, never exercised against a real server.

AP-141 also records the surviving ConstrainTo re-anchor divergence
under clause (b): for the adopted-body case (TryBind's shared-body
branch — an ordinary remote whose Missile bit is set by a later
State packet, so it still carries a live RemoteMotion), acdream now
ports retail's teleport-branch and far-branch StopInterpolating
action (Interp.Clear()), but never re-arms or re-anchors the
inherited ConstrainTo leash the way retail's HandleReceivedPosition
@0x00454254/@0x00454272 does on every nonzero return. The risk
column's earlier wording — that a stale leash "would drag the body
toward a stale anchor" — was wrong and is retracted in this same
commit: ConstraintManager.ConstraintPos is write-only in both retail
and the port (never read by AdjustOffset), and
ConstraintManager::adjust_offset @0x00556180 only tapers or zeroes an
already-composed per-tick offset while InContact — a leash brakes
motion the interp/sticky chain already produced, it cannot pull
anything toward the anchor. The real residual is one tick of un-reset
brake accumulator, contact-gated, and it cannot move an airborne
far-snapped missile at all (the clamp branch does not run while
airborne).

NO CONNECTED GATE EXISTS for this route, by design: ACE never sends a
missile UpdatePosition (see above), so retail's own server never
exercises this code path in play. Every proof obligation here is
test-gated only — Runtime and App-level fixtures constructing the
packet directly — never a live client/server capture.

Three review rounds closed 8 MAJOR findings before this landed:
round 1 (A1 App discarded the seam's status; A2/R1 silent swallow on
an unbound missile; A3/R2 the adopted-body teleport_hook never
wired; A4/A5 zero Runtime/App test coverage); round 2 (a
ParentCellId regression introduced by round 1's own R6 finding,
which the retail reviewer retracted the following round as factually
wrong — the fix here is the REVERT to record.FullCellId, not the
relocation round 1 shipped; B2 the far-branch StopInterpolating skip
never extended to the adopted-body case; residual App/Runtime store-
path coverage; a per-packet closure contradicting the file's own
#315 cached-delegate pattern). Round 3 closed on coverage alone (no
defect): the Advance() retry arm's projectile branch — added at
round 2, semantically reordered at round 2's B5 fix (skip prediction
invalidation on a re-parked Contention, since it writes nothing) —
had never been executed by any test; two new tests drive it directly
and are sabotage-verified against both the reordering and the
retry-arm's own SyncProjectilePresentation call site. The one
recorded defect this campaign produced (the ParentCellId regression)
was caused by complying with a review finding that its own author
later retracted — the standing lesson recorded for future rounds is
that review findings are evidence to re-verify against the code, not
commands to obey unconditionally.

Complete Release suite: 11,063 passed / 4 skipped / 0 failed
(baseline 11,036 at 30d3d114, +27 new tests across this campaign).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-04 21:03:41 +02:00
Erik
edc911b042 refactor(physics): collapse OnPosition's dual player/NPC remote tail into one
C4 route 4b-3 collapse (docs/research/2026-08-04-onposition-collapse-contract.md).
Behaviour-preserving: the ~640-line duplicated player-guid and NPC-guid
copies of the remote routing tail in LiveEntityNetworkUpdateController.OnPosition
become one guid-blind tail, reached by every remote guid through the single
ApplyRemoteContactRouting/RunRemoteArmTail seam.

Two guid-conditionals survive, both named and justified:
- Row 8 (TS-44 sticky suppression, creature-only): retail's sticky is
  independent of this acdream-only steady-state gate; the register row
  already describes it as NPC-only and this collapse does not widen it.
- The AirborneSnap arm's interp-clear + shadow-publish (rows 2a/2b,
  player-only preserve): unifying either way would be an unauthorized
  behaviour change. #316 (shadow publish) is a real, unmeasured
  pre-existing defect, deliberately preserved not fixed. The interp-clear's
  equivalence could not be proven for the steep-non-walkable-landing edge
  case (AdjustOffset's CONTACT-keyed gate vs. AP-139's WALKABLE-keyed
  per-tick clear) — preserved per contract stop condition 2 rather than
  shipped on an incomplete proof.

Category-(c) resolutions (contract §2.1-2.5), each with its evidence:
- Row 2a (interp clear): PRESERVED — AdjustOffset's `if (!inContact) return`
  proves inertness on flat landings, but not on the steep-contact edge case.
- Row 2b (shadow publish / #316): PRESERVED — no design note ever sanctioned
  the player-guid skip; the file's own #184 Slice 2b comments contradict it.
- Row 2c (EnsureRemoteMotionBindings): UNIFIED — the method is idempotent
  (`if (rm.Host is not null) return rm.Sink;`), so "always ensure" is safe.
- Row 3 (wire-cell adopt ordering): UNIFIED — RebucketLiveEntity already
  commits the wire cell before either guid branch runs, so the deleted
  player-guid pre-write was a proven no-op.
- Row 4 (LastServerPos/Time sample timing): UNIFIED — on a genuine first UP,
  InterpolationManager.Enqueue's already-close branch and the Snapped branch
  both converge on the same body pose/orientation for a zero-distance target.
- Row 12 (wall-clock capture): UNIFIED — one shared `nowSec`, a
  microsecond-scale skew in acdream-only bookkeeping/diagnostics.

Sabotage check (contract §5, performed and reverted, not committed):
deleting the one remaining TryArmConstraintAfterOperation call failed
10/16 dual-guid matrix tests, spanning BOTH guid halves of every
arming-dependent scenario (teleport, landing, near, far, sticky) — proof
the matrix discriminates a defect regardless of which guid range exercises
it, closing the class of bug that let 4b-3's A1/A2/R3 findings survive
review when only one copy's tests were green.

New tests/AcDream.App.Tests/Physics/LiveEntityNetworkOnPositionCollapseMatrixTests.cs
drives 8 scenarios x 2 guid ranges (0x50xxxxxx player, 0x8xxxxxxx creature)
through the complete production OnPosition entry point. Doc comments on
ApplyRemoteContactRouting, RunRemoteArmTail, ApplyWireAirborneLeftoverBookkeeping,
TryAdoptWireCellAfterRouting, and the AirborneNoOperation throw guard
updated to describe the collapsed one-path world (the "two callers stay
one decision" claim was true before this commit and false after — fixed
in the same commit that makes it false). One branch-routing source-text
pin (LiveEntityNetworkBranchRoutingTests.cs) updated to follow the AP-140
CONTACT gate to its new address inside ApplyRemoteContactRouting.

#316 stays OPEN, deliberately not fixed here — see its updated ISSUES.md
entry.

dotnet build AcDream.slnx -c Release: 0 errors. Verified independently
bisectable at this exact commit: AcDream.App.Tests 4104/4107 (3 pre-existing
skips), AcDream.Runtime.Tests 1125/1125.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-04 18:07:54 +02:00