docs(agents): regenerate hierarchical AGENTS.md for 2026-05-20

Sync the AGENTS.md hierarchy to current code state:

Drift fixes in 11 existing files
- Root: 2026-05-20 commit 39aadbf9f, ~2167 TS files, 120 barrel index.ts,
  57 src/hooks dirs, 297 (179 non-test) src/shared files, 11 OpenCode hook
  handlers in plugin-interface.ts, packages list adds ast-grep-mcp + rules-core,
  first-prompt-watchdog 206 LOC, parent-wake-notifier 587 LOC
- src/AGENTS.md: file counts, plugin-interface handler count
- src/shared/AGENTS.md: title + counts 278/170 -> 297/179
- src/hooks/AGENTS.md: 57 dirs, note unwired WIP (task-reminder,
  hashline-edit-diff-enhancer)
- src/features/AGENTS.md: module map with NON-TEST counts + sub-AGENTS.md
  column, 7 modules without sub-doc
- src/features/background-agent/AGENTS.md: add 12 newer files (parent-wake-
  notifier 587 LOC, loop-detector, error-classifier, fallback-retry-handler,
  process-cleanup, subagent-spawn-limits, session-status-classifier,
  compaction-aware-message-resolver, etc.)
- src/plugin/AGENTS.md: 11 handlers, add system-transform.ts + command-
  execute-before.ts + build-team-idle-wake-hint-client.ts
- src/config/AGENTS.md: note schema/internal/permission.ts
- src/cli/AGENTS.md: 8 commands including 'version'
- src/plugin-handlers/AGENTS.md, packages/web/AGENTS.md: date bump

New AGENTS.md in 4 directories
- packages/AGENTS.md: index of 15 packages (11 platform binaries + 2 MCP
  packages + rules-core + web), role map, conventions
- docs/AGENTS.md: WHERE TO LOOK table for 19 docs across 6 subdirs
- .opencode/AGENTS.md: 5 skills + 4 slash commands + relationship to .agents/
- .agents/AGENTS.md: superset migration target (9 skills + 4 commands)

src/hooks/AGENTS.md

@@ -1,10 +1,12 @@
-# src/hooks/ — ~52 Lifecycle Hooks Across 58 Dirs
+# src/hooks/ — ~52 Lifecycle Hooks Across 57 Dirs
 
-**Generated:** 2026-05-15
+**Generated:** 2026-05-20
 
 ## OVERVIEW
 
-52 hooks (5 of the 58 dirs are `zauc-mocks-*` test scaffolds + 1 `shared/`). 5-tier composition wired in `src/plugin/hooks/`. All hooks follow `createXXXHook(deps) → HookFunction` factory pattern.
+52 registered hooks. The 57 directories break down as: 48 registered hook dirs (with `index.ts`) + 6 standalone hook `.ts` files (bash-file-read-guard, context-window-monitor, empty-task-response-detector, preemptive-compaction, session-notification, tool-output-truncator) + support dirs (`shared/`, `team-session-events/`, 5 `zauc-mocks-*`/`zauc-sync-mocks`, `.sisyphus/` legacy state). 5-tier composition wired in `src/plugin/hooks/`. All hooks follow `createXXXHook(deps) → HookFunction` factory pattern.
+
+**Unwired WIP (do not modify casually):** `task-reminder/` (has `index.ts` + `createTaskReminderHook` but NOT exported from barrel, NOT imported by any composer) and `hashline-edit-diff-enhancer/` (has only `hook.ts`, NOT registered). Treat as orphaned until wired in.
 
 ## TIER COMPOSITION