feat(hooks): dsh-hooks-claude + dsh-hooks-codex bridges (hooks stack PR-F)

The two bridge plugins that run a user's existing Claude Code / Codex hook
config on the harness's typed interception seams, built on the shared
dsh-hook-protocol library. A bridge is a faithfulness adapter, not a power
tool: anything it does a native cordis plugin does more powerfully — the
bridge exists only to run UNMODIFIED external hooks.

- dsh-hooks-claude: CC dialect. Seven hook points (SessionStart,
  UserPromptSubmit, PreToolUse, PostToolUse, Stop, SubagentStart,
  SubagentStop), CC per-event stdin payloads, env + ${CLAUDE_PLUGIN_ROOT}/
  ${CLAUDE_PROJECT_DIR} substitution, literal-or-regex matcher.
- dsh-hooks-codex: Codex dialect — a deliberate subset. Five hook points,
  always-regex matcher, snake_case payloads (turn_id/model, no trailing
  newline), no env/substitution, block-only decisions.

Both map the neutral merged outcome onto the seam's typed Decision and stamp
an explicit {kind:'plugin'} source on injected context (so it is never
mislabeled as a user prompt). Config parse-failure is contained; only command
hooks run. updatedInput is logged+warned (input rewrite deferred); the Stop
loop-guard is deferred (TODO).

Tests: per-file 100% — config-parse unit branches + per-seam mappings
end-to-end through the REAL loop + REAL bash + REAL shell scripts (scripted
mock model only) + a real-Loader export-shape guard. A keyless ACP snapshot
scenario (hook-prompt-block) proves a UserPromptSubmit hook blocks a prompt
end-to-end (rejected turn -> ACP cancelled, hook/* events in the log); a
with-key e2e (hooks.e2e.ts) proves a PreToolUse hook blocks real bash
(verified on disk). The snapshot normalizer now scrubs hook/result.durationMs.

RFC: docs/rfc/implemented/feature/2026-06-30-hook-bridges.md

examples/acp-agent/tests/snapshot-normalize.spec.ts

@@ -90,4 +90,21 @@ describe('normalizeSessionLog', () => {
     const out = normalizeSessionLog(`${header({ id: ctx.sessionIds[0] })}\n`, ctx)
     expect(out).toContain('{{sessionId}}')
   })
+
+  it('zeroes a hook/result durationMs (run-to-run noise) but keeps its decision', () => {
+    const ev = JSON.stringify({
+      type: 'hook/result', seq: 2, time: 5,
+      data: { turn: 1, point: 'UserPromptSubmit', handlerId: 'h', decision: 'block', exitCode: 2, durationMs: 37 },
+    })
+    const out = normalizeSessionLog(`${header({})}\n${ev}\n`, ctx)
+    expect(out).toContain('"durationMs":0')
+    expect(out).not.toContain('37')
+    expect(out).toContain('"decision":"block"') // the decision is the behavior — kept
+  })
+
+  it('leaves a non-hook event durationMs untouched (only hook/result is scrubbed)', () => {
+    const ev = JSON.stringify({ type: 'tool/result', seq: 2, time: 5, data: { durationMs: 88 } })
+    const out = normalizeSessionLog(`${header({})}\n${ev}\n`, ctx)
+    expect(out).toContain('"durationMs":88')
+  })
 })