fix: ship idempotency + skill prefix name patching (v0.14.3.0) (#693)

* fix: add idempotency guards to /ship Steps 4, 7, 8 (#649)

If git push succeeds but gh pr create fails, re-running /ship would
double-bump VERSION and duplicate CHANGELOG entries. Now:
- Step 4: check if VERSION already differs from base branch
- Step 7: fetch only the specific branch, skip push if already up to date
- Step 8: if PR exists, update body via gh pr edit instead of creating duplicate

No CHANGELOG guard needed — Step 5 is already idempotent by design
("replace existing entries with one unified entry").

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: patch name: in SKILL.md frontmatter for prefix mode (#620, #578)

./setup --prefix creates gstack-* symlinks but SKILL.md still says
name: qa, so Claude Code ignores the prefix. Now:
- New bin/gstack-patch-names shared helper patches name: field via sed
- setup calls it after link_claude_skill_dirs
- gstack-relink calls it after symlink loop
- gen-skill-docs.ts prints warning when skill_prefix is true

Edge cases: gstack-upgrade not double-prefixed, root gstack skill
never prefixed, prefix removal restores original names, SKILL.md
without frontmatter is a safe no-op.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* test: add name patching + ship idempotency tests (#620, #649)

- 4 unit tests for name: patching in relink.test.ts (prefix on/off,
  gstack-upgrade not double-prefixed, no-frontmatter no-op)
- 2 tests for gen-skill-docs prefix warning
- 1 E2E test for ship idempotency (periodic tier)
- Updated setupMockInstall to write SKILL.md with proper frontmatter
- Added ship-idempotency touchfiles + tier classification

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* chore: bump version and changelog (v0.14.3.0)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: PR idempotency checks open state, dedupe touchfiles, sync package.json

- Step 8 PR guard now checks state==OPEN so closed PRs don't prevent
  new PR creation (adversarial review finding)
- Remove duplicate ship-idempotency entry in E2E_TOUCHFILES
- Sync package.json version to 0.14.3.0

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: patch name: before creating symlinks to fix --no-prefix ordering bug

gstack-patch-names must run BEFORE link_claude_skill_dirs so symlink
names reflect the correct (patched) name: values. Previously, switching
from --prefix to --no-prefix would read stale gstack-* names from
SKILL.md and create wrong symlinks. (Codex adversarial finding)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

scripts/gen-skill-docs.ts

@@ -472,3 +472,16 @@ if (failures.length > 0 && HOST_ARG_VAL === 'all') {
   if (failures.some(f => f.host === 'claude')) process.exit(1);
 }
 // Single host dry-run failure already handled above
+
+// After all hosts processed, warn if prefix patches may need re-applying
+if (!DRY_RUN) {
+  try {
+    const configPath = path.join(process.env.HOME || '', '.gstack', 'config.yaml');
+    if (fs.existsSync(configPath)) {
+      const config = fs.readFileSync(configPath, 'utf-8');
+      if (/^skill_prefix:\s*true/m.test(config)) {
+        console.log('\nNote: skill_prefix is true. Run gstack-relink to re-apply name: patches.');
+      }
+    }
+  } catch { /* non-fatal */ }
+}