phase 5.6: update PATCH-PRESERVATION-AUDIT + README for Round 6

Updates the audit doc to reflect Round 6 (Phase 5) outcomes:
- 122 active patches (was 119 in Round 5)
- Cumulative: 6 patches re-extracted from legacy-absorbed for test
  recipes (Phase 5.2: relibc-tests/recipe.toml and
  relibc-tests-bins/recipe.toml would fail without these patches)
- collision detection extended to [[package]].files (Phase 5.1)
- 8 regression tests added (Phase 5.4)
- base-fork push deadlock helper created (Phase 5.3)

Updates README.md Documentation list to point at:
- HOOKS.md (Phase 4.5)
- fork-push-status/ (Phase 4.1/5.3)

The PATCH-PRESERVATION-AUDIT cumulative reduction table extended:
  After Phase 5.2: 122 patches, 0 orphans (0%) — Round 6

Out-of-scope for Phase 1/2/3/4/5:
  - base fork push STILL DEADLOCKED (Phase 5.3 added operator-side
    helper at local/scripts/unblock-base-push.sh with 3 paths)
  - Collision detection extension #4 marked DONE in Phase 5.1

README.md

@@ -203,8 +203,10 @@ Red Bear OS operates under strict discipline. Full policies: [`local/AGENTS.md`]
 - [Greeter & Login](local/docs/GREETER-LOGIN-IMPLEMENTATION-PLAN.md) — Native greeter, auth daemon, session launch
 - [DRM Modernization](local/docs/DRM-MODERNIZATION-EXECUTION-PLAN.md) — DRM/KMS display and render maturity
 - [USB Plan](local/docs/USB-IMPLEMENTATION-PLAN.md) — USB stack design and implementation
-- [Patch Preservation Audit](local/docs/PATCH-PRESERVATION-AUDIT-2026-07-12.md) — orphan-patch governance, Round 1-3 audit results, SUPERSEDED.md log
+- [Patch Preservation Audit](local/docs/PATCH-PRESERVATION-AUDIT-2026-07-12.md) — orphan-patch governance, Rounds 1-6 audit results, SUPERSEDED.md log
 - [Collision Detection Status](local/docs/COLLISION-DETECTION-STATUS.md) — runtime collision-detection current state
+- [Hooks](local/docs/HOOKS.md) — opt-in git hooks (pre-push safety net, etc.)
+- [Fork Push Status](local/docs/fork-push-status/2026-07-12-Round-5-phase-4.1.md) — fork-branch push results + base deadlock
 - [Wi‑Fi Plan](local/docs/WIFI-IMPLEMENTATION-PLAN.md) — Wireless architecture and driver plan
 - [Bluetooth Plan](local/docs/BLUETOOTH-IMPLEMENTATION-PLAN.md) — Bluetooth stack design
 - [Build Cache](local/docs/BUILD-CACHE-PLAN.md) — Content-hash (BLAKE3) build cache system

local/docs/PATCH-PRESERVATION-AUDIT-2026-07-12.md

@@ -265,13 +265,19 @@ Three follow-on improvements after Round 3 closed:
   After Phase 2.1:     182 patches,   27 orphans (15%) — archived 69
   After Phase 3.0-3.2: 121 patches,    0 orphans (0%) — Round 3
   After Phase 4.3:     119 patches,    0 orphans (0%) — Round 5
+  After Phase 5.2:     122 patches,    0 orphans (0%) — Round 6
 
 Cumulative work to date: 132 patches archived as SUPERSEDED or
-INTEGRATED, 5 files cleaned up, 6 fork branches advanced to origin.
-Build system now has 100% patch preservation + 6 forks on origin
-with current Round 0-4 work.
+INTEGRATED, 5 files cleaned up, 6 fork branches advanced to origin,
+6 patches re-extracted from legacy-absorbed for test-recipe
+references (Round 6 Phase 5.2), collision detection extended to
+`[[package]].files` field (Phase 5.1) with 8 regression tests
+(Phase 5.4), operator-side base-push-unblock helper (Phase 5.3).
+Build system now has 100% patch preservation + collision detection
++ 4-check pre-push hook + operator-side fixes for the base-push
+deadlock.
 
-## Out-of-scope for Phase 1/2/3/4 (forward work)
+## Out-of-scope for Phase 1/2/3/4/5 (forward work)
 
 1. **bootloader fork rebase** — fork at `2f79630` is 927 files vs
    upstream 1.0.0's 77 files. Defer to `upgrade-forks.sh bootloader`
@@ -281,19 +287,20 @@ with current Round 0-4 work.
    as SUPERSEDED in Round 3 (file-restructured). The work landed
    via the 0.6.0 upstream converge. No follow-up needed.
 
-3. **base fork push to origin** — DEADLOCKED at end of Round 5
-   (Phase 4.1). gitea server's `receive.shallowUpdate=true` blocks
+3. **base fork push to origin** — STILL DEADLOCKED as of Round 6
+   (Phase 5.3). gitea server's `receive.shallowUpdate=true` blocks
    the base force-push. Local has 2569 ahead / 190 behind. Operator-
    side fix: disable `receive.shallowUpdate` on the gitea repo, or
    push via gitea's web UI (which can deepen the ref). Per
-   `local/docs/fork-push-status/2026-07-12-Round-5-phase-4.1.md`.
+   `local/scripts/unblock-base-push.sh` (Round 6) which provides
+   3 documented operator-side paths.
 
 4. **Collision detection extension** (Phase 4.2+ forward work):
-   - Currently only checks `[[package]].installs` paths, not
-     `[[package]].files` (different field)
-   - Doesn't trace dynamic file generation (e.g., base's initfs generator)
-   - Future: extend `verify-collision-detection.py` to also read
-     `[[package]].files` paths and trace installer source for
+   - **DONE in Phase 5.1**: now reads `[[package]].files` field as
+     well as `[[package]].installs`. 39 recipes use the `.files` form
+     (e.g. all the Round 3 system drivers).
+   - Still doesn't trace dynamic file generation (e.g., base's
+     initfs generator). Future: trace installer source for
      generated paths. See `local/docs/COLLISION-DETECTION-STATUS.md`.
 
 5. **Pre-receive server-side hook** (Phase 4.5+ forward work):