docs: close #297-#299 with SHAs; session handoff

Marks #297 (9b1e6fc6), #298 (bc0077a5) and #299 (88348f67) DONE per the
issue-tracking rule, and adds a handoff covering what landed, what still needs
the user's eyes, and the route 4 decision waiting on them.

Three items are implemented and suite-green but NOT user-verified: collision
with PKLite players (including the equip/unequip case round 1 got wrong),
melee/bow on a PKLite player plus the auto-target guard, and combat-camera
tracking of a PKLite opponent.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

docs/research/2026-08-03-session-handoff.md

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+# Session handoff — 2026-08-03
+
+Branch `claude/acdream-physics-divergence-5aa784`. `main` is still at `c7d5fc14`;
+nothing here is merged. Complete Release suite green at **10,904 passed /
+4 skipped / 0 failed** (session start: 10,844).
+
+## What landed
+
+| Commit | What |
+|---|---|
+| `9966b531` | **C4 route 2 — ForcePosition** through the canonical placement |
+| `69ba9486` | Retail `@pklite` client command (`EnterPkLite` 0x028F) |
+| `3ef61eb6` | Route 2 visual gate, rewritten with the real recipe |
+| `d980456f` | Route 2 connected gate **user-accepted** |
+| `e3b766d9` | Filed #297-#299 |
+| `40f57213` | **Route 4 scoping — budget failed, stop and re-plan** |
+| `88348f67` | **#299** mover-side `IsImpenetrable` exemption branch |
+| `9b1e6fc6` | **#297** keep the PWD bitfield live so PK status reaches the client |
+| `bc0077a5` | **#298** admit player targets to melee/missile attack and the camera |
+
+## Needs your eyes (nothing below is user-verified)
+
+Route 2 is accepted. These three are not:
+
+1. **Collision with PKLite players** (#297). Both parties `@pklite`, walk into
+   each other — you should now collide instead of phasing through. Then have
+   them **equip or unequip something** and try again: that is the case round 1
+   got wrong, and the fix is specifically about surviving it.
+2. **Melee/bow on a PKLite player** (#298). Select them, attack. Should work
+   now. Also confirm auto-target still refuses to acquire a player — pull a
+   monster with a PKLite player nearby and check auto-target picks the monster.
+3. **The combat camera** (#298). With `ViewCombatTarget` on (default), attacking
+   a PKLite opponent should now track them. Retail gates the camera on the same
+   predicate as the attack; we were using the narrow one.
+
+Recipe for getting into PK Lite is in
+[`2026-08-03-c4-route-2-visual-gate.md`](2026-08-03-c4-route-2-visual-gate.md).
+Remember PK Lite is a **one-way** character state.
+
+## The decision waiting for you: route 4
+
+I stopped rather than starting it. After route 2 I pinned a falsifiable budget —
+*if route 4 also costs ~900 production lines, the bet is dead* — and scoping came
+back at **1,500-2,500 lines** plus ~1,700 lines of test re-modelling.
+
+The seam generalises fine; route 2 just was not a representative unit (1 entity
+vs N, 1 disposition vs 4, 1 execution path vs 2, 2 duplicate authorities vs 6).
+
+**Recommendation: split route 4 into 4a and 4b.** 4a = near/interpolate +
+airborne no-op — the observable win, no park hazard. 4b = teleport/far/cellless,
+where the parks, the service-window guard, N3 and #277 all live.
+
+Full analysis, including four findings that change the campaign plan (route 4's
+Create half is already done; AP-131 cannot be retired by route 4; #277's safety
+bound breaks; N3 stops being latent) is in
+[`2026-08-03-c4-route-4-scoping.md`](2026-08-03-c4-route-4-scoping.md).
+
+## Open follow-ups filed this session
+
+- **#300** — `Properties.Ints[134]` vs `PublicWeenieBitfield` mirror gap.
+- **#301** — retail's `OnStatUpdated` also rewrites radar blip colour and radar
+  behaviour; acdream ignores both. #297 for the radar.
+- **#302** — `PortalProjectionTests.ClipToRegion_FrameOwnedStore_ReusesExactResultArray`
+  is flaky, ~1 run in 6, a `GC.GetAllocatedBytesForCurrentThread` assertion.
+  **A green suite is not proof this is gone.**
+- **#303** — `LiveEntityPvpBitfieldSync` is App-resident but touches only
+  Runtime-owned state.
+- **#304** — `SelectionInteractionController.GetSelectedOrClosestCombatTarget`
+  has no production caller; one of #298's two widened call sites is dead code.
+- **#305** — `HeadlessGameplayOperations` has #298's bug unpatched, so the
+  graphical and headless hosts now diverge.
+
+Register rows added: **AP-134** (the replicated PWD-bitfield coherence
+invariant). **TS-23**'s retirement narrative corrected — it claimed since July
+that every mover-flags site read the mover's "real" PK bits; the bits existed but
+their source was frozen, so that only became true at #297.
+
+## Process notes worth keeping
+
+- **Four implementation passes and five review rounds on route 2, and every
+  intermediate state was green** — 10,848, 10,853, 10,856, 10,858. The suite
+  caught none of the four real defects. Two of them were introduced *by* the
+  fixes for the other two.
+- **Demanded regression tests found root causes that review missed.** #297's
+  "assert the flags survive an appearance rebuild" test is what exposed the
+  second snapshot store.
+- **Three false claims reached documentation and were retracted before
+  commit** — a "retail fidelity gain" that was a fixture artifact, an
+  acceptance-coverage claim in the cutover plan, and an IA-19 citation covering
+  a divergence it does not reach. Each would have become the thing a future
+  session trusted.
+- **Go to the bytes when the decompiler is ambiguous.** #299 turned on whether
+  `if (state_1 < 0)` was a 0x80 or 0x8000 test; decoding the PDB-paired binary
+  settled it (`test al,al; js`).