chore: restructure skills repo with new agents and skill bundles

- Add new skills: deep-dive, docs-rag, meta-creator, ppt-maker, sdlc
- Add agent configs: g-assistent, meta-creator, sdlc with prompt files
- Add reference docs for custom agents and skills specification
- Add utility scripts: install-agents.sh, orchestrate.py, puml2svg.sh
- Update README and commit-message skill config
- Remove deprecated skills: codereview, python, testing, typescript
- Add .gitignore

skills/meta-creator/assets/workflow.puml

@@ -0,0 +1,30 @@
+@startuml meta-creator-workflow
+skinparam defaultFontName Arial
+skinparam backgroundColor #FAFAFA
+
+actor Developer
+participant "meta-creator\nSkill" as SKILL
+participant "File System" as FS
+
+Developer -> SKILL : "create a skill: <description>"
+SKILL -> Developer : clarifying questions\n(purpose, examples, env)
+Developer -> SKILL : answers
+
+SKILL -> FS : write skills/<name>/SKILL.md
+SKILL -> FS : write skills/<name>/evals/evals.json
+SKILL --> Developer : skill created
+
+opt eval results provided
+  Developer -> SKILL : eval failures / feedback
+  SKILL -> SKILL : identify gaps vs wrong assertions
+  SKILL -> FS : update SKILL.md
+  SKILL -> FS : update evals.json
+  SKILL --> Developer : improved skill
+end
+
+opt agent requested
+  SKILL -> FS : write .kiro/agents/<name>.json
+  SKILL -> FS : write .kiro/agents/prompts/<name>.md
+  SKILL --> Developer : agent ready
+end
+@enduml