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/architecture.puml

@@ -0,0 +1,32 @@
+@startuml meta-creator-architecture
+skinparam componentStyle rectangle
+skinparam defaultFontName Arial
+skinparam backgroundColor #FAFAFA
+
+package "meta-creator Skill" {
+  component "SKILL.md\n(instructions)" as SKILL
+  component "references/\nskills-Specification.md" as SPEC
+  component "references/\nskills-eval.md" as EVAL_REF
+  component "references/\ncustom-agents-configuration-reference.md" as AGENT_REF
+  component "references/\nkiro-cli-chat-configuration.md" as CLI_REF
+  component "evals/evals.json" as EVALS
+}
+
+package "Outputs" {
+  component "skills/<name>/SKILL.md" as OUT_SKILL
+  component "skills/<name>/evals/evals.json" as OUT_EVALS
+  component ".kiro/agents/<name>.json" as OUT_AGENT #lightblue
+  component ".kiro/agents/prompts/<name>.md" as OUT_PROMPT #lightblue
+}
+
+SKILL --> SPEC : skill format rules
+SKILL --> EVAL_REF : eval methodology
+SKILL --> AGENT_REF : agent config schema
+SKILL --> CLI_REF : config scopes & paths
+SKILL --> OUT_SKILL : creates
+SKILL --> OUT_EVALS : creates
+SKILL --> OUT_AGENT : creates (optional)
+SKILL --> OUT_PROMPT : creates (optional)
+
+note right of OUT_AGENT : only if user\nrequests an agent
+@enduml