feat(L.2g-S2b): wire remote entities onto the CMotionInterp funnel (DEV-1 integration)

OnLiveMotionUpdated's remote branch (368 lines of bulk-copy + cycle
picker + per-axis DoInterpretedMotion + command-list router) collapses
to: build InboundInterpretedState from the wire (retail UnPack defaults;
MoveTo packets feed the PlanMoveToStart seed as the forward command) ->
MotionInterpreter.MoveToInterpretedState(ims, RemoteMotionSink) ->
sink.Commit().

RemoteMotionSink (new, App): receives the funnel's gate-passed
dispatches in retail order; the axis-priority pick (fwd > side > turn),
Run->Walk->Ready missing-cycle fallback, overlay routing, ObservedOmega
seeding, and diag lines are MOVED VERBATIM from the pre-S2 block.
Register row AP-73 documents the single-cycle composition approximation
(retail blends modifiers via re_modify — DEV-9, retires with S3/S6).

Retail-verbatim behavior changes:
- Absent stance now defaults to NonCombat 0x8000003D (retail UnPack
  default, S0-trace-verified) instead of keep-current.
- Remote command lists flow through the funnel's 15-bit action-stamp
  gate — retail's actual mechanism for ACE's re-bundled stale entries;
  the old skip-SubState router workaround is now local-player-only.
- Airborne cycle preservation is the funnel's contact_allows_move gate
  (K-fix17's guard semantics, now from the retail mechanism).
- Stops ride the same path: empty UM -> flat copy -> Ready dispatch ->
  get_state_velocity 0 (DEV-3 core; the 300ms stop-detection fallback
  stays until S6 verifies NPC unification).

Full suite green (3290). Live smoke next.

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

docs/architecture/retail-divergence-register.md

@@ -99,7 +99,7 @@ accepted-divergence entries (#96, #49, #50).
 
 ---
 
-## 3. Documented approximation (AP) — 68 rows
+## 3. Documented approximation (AP) — 69 rows
 
 | # | Divergence | Where (file:line) | Why it is safe / justified | Risk if assumption breaks | Retail oracle |
 |---|---|---|---|---|---|
@@ -176,6 +176,8 @@ accepted-divergence entries (#96, #49, #50).
 
 ---
 
+| AP-73 | **Remote motion sink maps retail's substate+modifier animation model onto ONE cycle** — the L.2g S2 funnel dispatches retail-verbatim (style/forward/sidestep/turn per `apply_interpreted_movement` order + action-stamp gate), but `RemoteMotionSink.Commit` resolves the axes into a single `SetCycle` (forward locomotion > sidestep > turn priority + Run→Walk→Ready missing-cycle fallback); retail BLENDS modifiers over the substate cycle via `CMotionTable::re_modify` (DEV-9) | `src/AcDream.App/Rendering/RemoteMotionSink.cs` (`Commit`) | The pick + fallback are the pre-S2 behavior moved verbatim (user-verified across L.1/L.3); the STATE side is now fully retail through the funnel, so only the visible-animation composition approximates. Retire with the S3/S6 modifier port (`re_modify` + `subtract_motion` omega/velocity combine) | Run-while-turning shows pure run legs (no lean/turn blend); sidestep-while-walking shows one cycle only — animation-composition mismatch vs retail observers, position unaffected | `CMotionTable::re_modify` (GetObjectSequence tail, pc:298636); `StopSequenceMotion` modifier branch pc:298954 |
+
 ## 4. Temporary stopgap (TS) — 33 rows
 
 | # | Divergence | Where (file:line) | Why it is safe / justified | Risk if assumption breaks | Retail oracle |