fix(#2432,#2424): pre-dispatch PLAN.md commit + reapply-patches baseline detection; docs(#2397): config schema drift (#2469)

- quick.md Step 5.6: commit PLAN.md to base branch before worktree executor
  spawn when USE_WORKTREES is active, preventing CC #36182 path-resolution
  drift that caused silent writes to main repo instead of worktree
- reapply-patches.md Option A: replace first-add commit heuristic with
  pristine_hashes SHA-256 matching from backup-meta.json so baseline detection
  works correctly on multi-cycle repos; first-add fallback kept for older
  installers without pristine_hashes
- CONFIGURATION.md: move security_enforcement/security_asvs_level/security_block_on
  to workflow.* (matches templates/config.json and workflow readers); rename
  context_profile → context (matches VALID_CONFIG_KEYS in config.cjs); add
  planning.sub_repos to schema example
- universal-anti-patterns.md + context-budget.md: fix context_window_tokens →
  context_window (the actual key name in config.cjs)

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

commands/gsd/reapply-patches.md

@@ -129,7 +129,7 @@ The quality of the merge depends on having a **pristine baseline** — the origi
 
 Check for baseline sources in priority order:
 
-### Option A: Git history (most reliable)
+### Option A: Pristine hash from backup-meta.json + git history (most reliable)
 If the config directory is a git repository:
 ```bash
 CONFIG_DIR=$(dirname "$PATCHES_DIR")
@@ -137,15 +137,35 @@ if git -C "$CONFIG_DIR" rev-parse --git-dir >/dev/null 2>&1; then
   HAS_GIT=true
 fi
 ```
-When `HAS_GIT=true`, use `git log` to find the commit where GSD was originally installed (before user edits). For each file, the pristine baseline can be extracted with:
+When `HAS_GIT=true`, use the `pristine_hashes` recorded in `backup-meta.json` to locate the correct baseline commit. For each file, iterate commits that touched it and find the one whose blob SHA-256 matches the recorded pristine hash:
 ```bash
-git -C "$CONFIG_DIR" log --diff-filter=A --format="%H" -- "{file_path}"
+# Get the expected pristine SHA-256 from backup-meta.json
+PRISTINE_HASH=$(jq -r ".pristine_hashes[\"${file_path}\"] // empty" "$PATCHES_DIR/backup-meta.json")
+
+BASELINE_COMMIT=""
+if [ -n "$PRISTINE_HASH" ]; then
+  # Walk commits that touched this file, pick the one matching the pristine hash
+  while IFS= read -r commit_hash; do
+    blob_hash=$(git -C "$CONFIG_DIR" show "${commit_hash}:${file_path}" 2>/dev/null | sha256sum | cut -d' ' -f1)
+    if [ "$blob_hash" = "$PRISTINE_HASH" ]; then
+      BASELINE_COMMIT="$commit_hash"
+      break
+    fi
+  done < <(git -C "$CONFIG_DIR" log --format="%H" -- "${file_path}")
+fi
+
+# Fallback: if no pristine hash in backup-meta (older installer), use first-add commit
+if [ -z "$BASELINE_COMMIT" ]; then
+  BASELINE_COMMIT=$(git -C "$CONFIG_DIR" log --diff-filter=A --format="%H" -- "${file_path}" | tail -1)
+fi
 ```
-This gives the commit that first added the file (the install commit). Extract the pristine version:
+Extract the pristine version from the matched commit:
 ```bash
-git -C "$CONFIG_DIR" show {install_commit}:{file_path}
+git -C "$CONFIG_DIR" show "${BASELINE_COMMIT}:${file_path}"
 ```
 
+**Why this matters:** `git log --diff-filter=A` returns the commit that *first added* the file, which is the wrong baseline on repos that have been through multiple GSD update cycles. The `pristine_hashes` field in `backup-meta.json` records the SHA-256 of the file as it existed in the pre-update GSD release — matching against it finds the correct baseline regardless of how many updates have occurred.
+
 ### Option B: Pristine snapshot directory
 Check if a `gsd-pristine/` directory exists alongside `gsd-local-patches/`:
 ```bash