test(plan-tune): 5 cathedral E2E scenarios + touchfile registration

Plan-tune cathedral T16 (per D12 — all 5 in gate tier). One consolidated
file with five describeIfSelected scenarios, each selectable by its own
touchfile entry so they only run when the relevant code changes (or
EVALS_ALL=1 forces all):

  plan-tune-hook-capture     — PostToolUse hook fires → question-log fills
  plan-tune-enforcement      — never-ask + marker + 2-way → deny+reason
                               + auto-decided event logged
  plan-tune-annotation       — declared profile + memory nugget
                               → additionalContext surfaced on defer
  plan-tune-codex-import     — synthetic JSONL → import bin → log with
                               source=codex-import-marker
  plan-tune-dream-cycle      — apply proposal → re-fire question
                               → memory injected via additionalContext

Each scenario fixtures an isolated git repo + bins + scripts + hooks
under tmp, then exercises the cathedral chain end-to-end against real
on-disk binaries (no mocks at the bin layer). GSTACK_STATE_ROOT keeps
the user's real ~/.gstack untouched.

These five complement the existing unit tests by proving the full
sub-process chain works (not just individual functions in isolation).
They DON'T spawn claude -p because the cathedral's substrate behavior is
deterministic — agent compliance is no longer the variable. The existing
test/skill-e2e-plan-tune.test.ts (plan-tune-inspect) still covers the
LLM-driven intent-routing behavior.

Cost: each scenario runs in ~1s with $0 because no claude -p invocations.
Touchfile-gated, so they only run on PRs that touch cathedral code.

Also fixes a bug found by the E2E: question-log-hook didn't pass the
incoming tool call's cwd to spawnSync when invoking gstack-question-log,
so the bin used the hook process's cwd (the repo root) instead of the
session's cwd. Result: log writes landed in the wrong project bucket.
Fix mirrors the same cwd-passing pattern from question-preference-hook.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

hosts/claude/hooks/question-log-hook.ts

@@ -204,7 +204,7 @@ function detectSkill(cwd: string | undefined): string {
   return 'unknown';
 }
 
-function spawnLog(payload: Record<string, unknown>): void {
+function spawnLog(payload: Record<string, unknown>, cwd?: string): void {
   // Locate the bin relative to this script's directory.
   const here = path.dirname(new URL(import.meta.url).pathname);
   // hosts/claude/hooks/ -> ../../../bin/
@@ -214,6 +214,9 @@ function spawnLog(payload: Record<string, unknown>): void {
     encoding: 'utf-8',
     stdio: ['ignore', 'pipe', 'pipe'],
     timeout: 3000,
+    // Run from the originating tool call's cwd so gstack-slug resolves to
+    // the project the user is actually in, not the hook script's location.
+    cwd: cwd && fs.existsSync(cwd) ? cwd : undefined,
   });
   if (res.status !== 0) {
     logHookError(`gstack-question-log exited ${res.status}: ${res.stderr || res.stdout}`);
@@ -274,7 +277,7 @@ async function main(): Promise<void> {
     if (recommended) payload.recommended = recommended.slice(0, 64);
     if (choice.free_text) payload.free_text = String(choice.free_text);
 
-    spawnLog(payload);
+    spawnLog(payload, stdin.cwd);
   }
 
   process.exit(0);