restore hook/result durationMs — review keeps wall-clock audit timing durable

Reverses item 3 of the tighten-hook-protocol-contract RFC per review:
a persistence log is written for future readers, and hook wall-clock
runtime is audit signal (which hook made a turn slow). runHook keeps
its injected now clock and RunHookResult wrapper, the bridges pass the
measured duration through HookResultRecord, the snapshot normalizer
keeps its replay scrub, and the hook fixtures carry the field again.
The RFC records the reversal; the other three prunes stand.

packages/hooks/hooks-codex/src/index.ts

@@ -121,7 +121,7 @@ export function apply(ctx: Context, config: Config): void {
             ...group.matcher !== undefined ? { matcher: group.matcher } : {},
           })
         }
-        const output = await runHook(ctx.bash, hook, {
+        const { output, durationMs } = await runHook(ctx.bash, hook, {
           payload,
           defaultTimeoutMs,
           ...workdir !== undefined ? { cwd: workdir } : {},
@@ -129,7 +129,7 @@ export function apply(ctx: Context, config: Config): void {
           trailingNewline: false, // Codex writes stdin WITHOUT a trailing newline.
           // Discard a `hookSpecificOutput` block naming a different event.
           expectedEventName: point,
-        })
+        }, () => performance.now())
         // Codex's SessionStart/UserPromptSubmit treat a CLEAN hook's PLAIN
         // (non-JSON) stdout as additionalContext. The codec keeps that raw text on
         // `output.stdout` but only sets `additionalContext` from a JSON
@@ -150,7 +150,7 @@ export function apply(ctx: Context, config: Config): void {
           ctx.logger.warn(`hooks-codex: ${point} hook emitted a systemMessage, which is not yet surfaced (ignored)`)
         }
         if (session && opts.turn !== undefined) {
-          appendHookResult(session, { turn: opts.turn, point, handlerId, output, stderrSummaryMaxChars })
+          appendHookResult(session, { turn: opts.turn, point, handlerId, output, stderrSummaryMaxChars, durationMs })
         }
       }
     }