feat: add uncommitted planning mode (#107)

* feat: add uncommitted planning mode

Add config option to keep planning docs local-only (not committed to git).
Useful for OSS contributions, client projects, or keeping planning private.

Config options in .planning/config.json:
- planning.commit_docs: true/false (default: true)
- planning.search_gitignored: true/false (default: false)

When commit_docs=false:
- All git operations for .planning/ files are skipped
- User should add .planning/ to .gitignore
- Planning system works normally, just not tracked

Updated files:
- config.json template: added planning section
- execute-plan.md: conditional git commits
- execute-phase.md: conditional git commits
- create-roadmap.md: conditional git commits
- help.md: documented new config options
- planning-config.md: reference doc for config behavior

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* feat: extend commit_docs check to all agents/commands/workflows

Add COMMIT_PLANNING_DOCS config check to all files that commit
.planning/ artifacts, ensuring consistent behavior when
commit_docs=false is set in config.json.

Updated:
- 5 agents (planner, executor, debugger, phase-researcher, synthesizer)
- 8 commands (add-todo, check-todos, execute-phase, new-milestone,
  pause-work, plan-milestone-gaps, remove-phase, research-project)
- 7 workflows (complete-milestone, create-milestone, define-requirements,
  diagnose-issues, discuss-phase, map-codebase, verify-work)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix(progress): use Bash instead of Glob for .planning/ check

Glob respects .gitignore, so projects with gitignored .planning/
directories would fail with "No planning structure found."

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix(new-milestone): integrate full research/requirements/roadmap flow

Previously routed to non-existent /gsd:research-project and
/gsd:define-requirements commands. Now handles the full flow inline
like new-project does:

- Phase 7: Research Decision (spawns 4 milestone-aware researchers)
- Phase 8: Define Requirements (scopes features, creates REQUIREMENTS.md)
- Phase 9: Create Roadmap (continues phase numbering from previous milestone)
- Phase 10: Done

Key adaptations for milestones:
- Research focuses on NEW features only
- Requirements add to existing, don't start fresh
- Phase numbering continues from previous milestone

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

commands/gsd/progress.md

@@ -21,6 +21,12 @@ Provides situational awareness before continuing work.
 <step name="verify">
 **Verify planning structure exists:**
 
+Use Bash (not Glob) to check—Glob respects .gitignore but .planning/ is often gitignored:
+
+```bash
+test -d .planning && echo "exists" || echo "missing"
+```
+
 If no `.planning/` directory:
 
 ```