fix: resolve merge conflicts with origin/main (v0.4.3 + v0.4.4)

Merge origin/main which added:
- v0.4.3: /document-release skill, simplified AskUserQuestion (always ELI16),
  runtime branch detection via _BRANCH preamble variable
- v0.4.4: 60-min update check TTL, --force flag for gstack-update-check

Resolved conflicts:
- VERSION: keep 0.6.0 (our version, above 0.4.4)
- CHANGELOG: all entries preserved (0.6.0 > 0.4.4 > 0.4.3 > 0.4.2)
- TODOS.md: keep both sections (Brainstorm/Design + Document-Release)
- test/skill-validation.test.ts: include all three new skills in arrays
  (brainstorm, debug, document-release)

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

test/skill-validation.test.ts

@@ -177,6 +177,7 @@ describe('Update check preamble', () => {
     'plan-ceo-review/SKILL.md', 'plan-eng-review/SKILL.md',
     'retro/SKILL.md',
     'brainstorm/SKILL.md', 'debug/SKILL.md',
+    'document-release/SKILL.md',
   ];
 
   for (const skill of skillsWithUpdateCheck) {
@@ -398,6 +399,7 @@ describe('No hardcoded branch names in SKILL templates', () => {
     'qa/SKILL.md.tmpl',
     'plan-ceo-review/SKILL.md.tmpl',
     'retro/SKILL.md.tmpl',
+    'document-release/SKILL.md.tmpl',
   ];
 
   // Patterns that indicate hardcoded 'main' in git commands
@@ -481,6 +483,7 @@ describe('v0.4.1 preamble features', () => {
     'plan-ceo-review/SKILL.md', 'plan-eng-review/SKILL.md',
     'retro/SKILL.md',
     'brainstorm/SKILL.md', 'debug/SKILL.md',
+    'document-release/SKILL.md',
   ];
 
   for (const skill of skillsWithPreamble) {
@@ -493,7 +496,7 @@ describe('v0.4.1 preamble features', () => {
     test(`${skill} contains session awareness`, () => {
       const content = fs.readFileSync(path.join(ROOT, skill), 'utf-8');
       expect(content).toContain('_SESSIONS');
-      expect(content).toContain('ELI16');
+      expect(content).toContain('RECOMMENDATION');
     });
   }