fix(#2136): migrate ALL operator-facing date sites to localToday (anti-pattern elimination)

The UTC-slice anti-pattern (deriving a calendar day a human reads by slicing a
UTC instant) remained in several operator-facing sites beyond the original
seamed last_activity set. Eliminate it everywhere a human reads the value as a
calendar day — do not leave known bad code in place:

- commands.cts cmdTodoComplete + cmdScaffold: completion/scaffold dates.
- gsd2-import.cts: migrated STATE.md 'Last activity' / 'Last session'.
- template.cts: plan frontmatter 'completed:' date.
- verify.cts: health --repair session-log date + '(Backfilled: <date>)' header.
- workstream.cts: workstream-create 'Last Activity' / 'created' + archive dirname.
- init.cts: JSON-bundle 'date' (-> localToday) + 'timestamp' (-> nowIso) at all
  three sites; drop the now-dead 'const now = new Date()' in cmdInitTodos /
  cmdInitMapCodebase (cmdInitQuick keeps it for the local branch-id derivation).
- state.cts: prune-archive '## Pruned <date>' header.
- state-transition.cts: the 7 seamed last_activity writes (prior commit).

No realClock.today() / .clock.today() / raw new Date().toISOString().split('T')
operator-facing sites remain in src/. Rebuilds the tracked
bin/lib/state-transition.cjs artifact to match.

src/init.cts

@@ -10,6 +10,7 @@ import fs from 'node:fs';
 import path from 'node:path';
 import os from 'node:os';
 import { execGit, platformWriteSync, platformReadSync } from './shell-command-projection.cjs';
+import { realClock } from './clock.cjs';
 // eslint-disable-next-line @typescript-eslint/no-require-imports -- io.cjs is an export= CommonJS module
 import io = require('./io.cjs');
 // eslint-disable-next-line @typescript-eslint/no-require-imports -- config-loader.cjs is an export= CommonJS module
@@ -820,8 +821,8 @@ function cmdInitQuick(cwd: string, description: string | undefined, raw: boolean
     slug: slug,
     description: description || null,
 
-    date: now.toISOString().split('T')[0],
-    timestamp: now.toISOString(),
+    date: realClock.localToday(),
+    timestamp: realClock.nowIso(),
 
     quick_dir: '.planning/quick',
     task_dir: slug ? `.planning/quick/${quickId}-${slug}` : null,
@@ -1133,7 +1134,6 @@ function cmdInitPhaseOp(cwd: string, phase: string, raw: boolean): void {
 
 function cmdInitTodos(cwd: string, area: string | undefined, raw: boolean): void {
   const config = loadConfig(cwd);
-  const now = new Date();
 
   const pendingDir = path.join(planningDir(cwd), 'todos', 'pending');
   let count = 0;
@@ -1176,8 +1176,8 @@ function cmdInitTodos(cwd: string, area: string | undefined, raw: boolean): void
   const result: Record<string, unknown> = {
     commit_docs: config.commit_docs,
 
-    date: now.toISOString().split('T')[0],
-    timestamp: now.toISOString(),
+    date: realClock.localToday(),
+    timestamp: realClock.nowIso(),
 
     todo_count: count,
     todos,
@@ -1306,7 +1306,6 @@ function cmdInitMilestoneOp(cwd: string, raw: boolean): void {
 
 function cmdInitMapCodebase(cwd: string, raw: boolean): void {
   const config = loadConfig(cwd);
-  const now = new Date();
 
   const codebaseDir = path.join(planningRoot(cwd), 'codebase');
   let existingMaps: string[] = [];
@@ -1324,8 +1323,8 @@ function cmdInitMapCodebase(cwd: string, raw: boolean): void {
     parallelization: config.parallelization,
     subagent_timeout: config.subagent_timeout,
 
-    date: now.toISOString().split('T')[0],
-    timestamp: now.toISOString(),
+    date: realClock.localToday(),
+    timestamp: realClock.nowIso(),
 
     codebase_dir: '.planning/codebase',