fix(agent hooks): wire hooks into real harness entry points and fix payload parsing

Claude Code never reads a standalone .claude/hooks.json, so the PostToolUse and
Stop pipeline is moved into .claude/settings.json and hooks.json is removed;
.cursor/hooks.json is rewritten in Cursor's version+afterFileEdit/stop schema;
.codex/hooks.json is already Codex-valid and stays. The shared scripts now
parse both the Cursor file_path and Claude/Codex tool_input.file_path stdin
shapes and normalize absolute paths, so the format, yarn-install, and
react-pattern-review hooks stop being silent no-ops. verify.sh blocks with
exit 2 plus a stderr reason, guards stop_hook_active, and skips clean trees;
react-pattern-review surfaces its reminder via hookSpecificOutput on
PostToolUse; sync-git-branches no longer misreports open PRs as merged. The
validator now checks that the three harness-specific entry points wire the
same hook scripts instead of requiring byte-identical hooks.json copies.

scripts/agent-hooks/format.sh

@@ -1,14 +1,16 @@
 #!/bin/bash
 
-# afterFileEdit hook: Auto-format files after AI edits them
-# Receives JSON via stdin: {"file_path": "...", "edits": [...]}
+# afterFileEdit/PostToolUse hook: Auto-format files after AI edits them
+# Stdin JSON differs per harness:
+#   Cursor afterFileEdit:      {"file_path": "...", "edits": [...]}
+#   Claude/Codex PostToolUse:  {"tool_input": {"file_path": "..."}, ...}
 
 input=$(cat)
 if ! command -v jq >/dev/null 2>&1; then
   exit 0
 fi
 
-file_path=$(printf '%s' "$input" | jq -r '.file_path // empty' 2>/dev/null)
+file_path=$(printf '%s' "$input" | jq -r '.tool_input.file_path // .file_path // empty' 2>/dev/null)
 
 if [ -z "$file_path" ]; then
   exit 0
@@ -17,8 +19,15 @@ fi
 repo_root="$(git rev-parse --show-toplevel 2>/dev/null || pwd)"
 cd "$repo_root" || exit 0
 
+# Claude Code and Codex deliver absolute paths; make them repo-relative and
+# skip anything outside the repo.
 case "$file_path" in
-  *.js|*.ts|*.tsx|*.mjs)
+  "$repo_root"/*) file_path="${file_path#"$repo_root"/}" ;;
+  /*) exit 0 ;;
+esac
+
+case "$file_path" in
+  *.js|*.jsx|*.cjs|*.mjs|*.ts|*.tsx)
     dir_part="${file_path%/*}"
     base_name="${file_path##*/}"
     if [ "$dir_part" = "$file_path" ]; then