Add analyze-project — Root Cause Analyst skill (#297)
* Add analyze-project — Root Cause Analyst skill
New forensic analysis skill for Antigravity.
Reads brain/ artifacts (task.md, plans, walkthroughs + .resolved.N versions), classifies scope changes, rework shapes, root causes (SPEC_AMBIGUITY, REPO_FRAGILITY, etc.), clusters friction hotspots, and auto-updates project-health-state + prompt_improvement_tips.md.
Full workflow and SKILL.md included.
* Update SKILL.md
Shorten frontmatter description to pass validation (<200 chars)
* Update SKILL.md
Fix YAML syntax + shorten description to pass validation (<200 chars); improve portability
* Create sample_session_analysis_report.md
Add examples/ with trimmed sample output report to demonstrate skill results
* Update SKILL.md
Fix non-portable hardcoded path in Step 11a (project-health-state) per bot feedback
80abf0f4d6