docs(memory): update handover HEAD to 9fb24e8; R1-R9 complete

.claude/memory/ai-handover.md

@@ -13,11 +13,12 @@ git log -8 --oneline --decorate
 git status --short                  # uncommitted work may be the real current state
 ```
 
-- **Recorded HEAD when this was written: `a2a7d7d`** ("R8: swell the music into the payoff"). The 2026-07-23/24
-  session committed, in order: `1da0661` two-tier director + source-adaptive rendering, `30c832e` loudness
-  mastering, `f03d547` R6 crossfades, `67bdf68` R7 bold overlays, `407f6b5` Tier-2 caption-driven selection,
-  `a2a7d7d` R8 music swell. The cinematic ruleset R1–R9 (docs/cinematic-quality-rules.md) is COMPLETE except the
-  R6 speed-ramp sub-item (deferred — conflicts with the R5 push-in + timeline math).
+- **Recorded HEAD when this was written: `9fb24e8`** ("R6 speed-ramp: ease into slow-motion"). The 2026-07-23/24
+  session committed: `1da0661` two-tier director + source-adaptive rendering, `30c832e` loudness mastering,
+  `f03d547` R6 crossfades, `67bdf68` R7 bold overlays, `407f6b5` Tier-2 caption-driven selection, `a2a7d7d` R8
+  music swell, `4d2cea1` fix music-cut-off-early (separate video/audio crossfade passes), `9fb24e8` R6 speed-ramp.
+  **The cinematic ruleset R1–R9 (docs/cinematic-quality-rules.md) is COMPLETE.** Remaining = production hardening
+  (P5.8), commercial licensing (P5.7, audio models are CC-BY-NC), and a formal human Gate-B review (P5.6).
 - **Env note (2026-07-24):** the sandbox began denying the default `$TMPDIR` and socket binds mid-session; see
   [[highlight-e2e-render-runbook]] for the java.io.tmpdir + dangerouslyDisableSandbox workarounds.
 - If HEAD is newer than `8b68116`, or there are unfamiliar commits/uncommitted files, **this file is behind