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/docs-rag/README.md

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+# docs-rag
+
+Retrieval-augmented generation over a local `docs/` directory of 3GPP Release 19 specifications.
+
+## Architecture
+
+![Architecture](assets/docs-rag-architecture.svg)
+
+## Workflow
+
+![Workflow](assets/docs-rag-workflow.svg)
+
+## When to Use
+
+- Questions about 3GPP specs, Release 19 features, mission critical services, ambient IoT, ISAC, UAV/drone support, network sharing, SNPN interconnect, traffic steering/split
+- Rebuilding or refreshing the document index after adding new files
+
+## How It Works
+
+1. Reads `data/index.json` (spec number, title, keywords, summary, file path)
+2. Matches the query against `keywords` and `summary` fields
+3. Answers from the summary if sufficient; reads the actual file for deeper detail
+4. Always cites the spec number and version in the answer
+
+## Indexed Documents
+
+| Spec | Title |
+|------|-------|
+| TS 22.280 | Mission Critical Services Common Requirements |
+| TS 22.369 | Service Requirements for Ambient IoT |
+| TR 22.837 | Integrated Sensing and Communication (ISAC) |
+| TR 22.840 | Study on Ambient Power-enabled IoT |
+| TR 22.841 | Traffic Steer/Switch/Split over Dual 3GPP Access |
+| TR 22.843 | UAV Phase 3 |
+| TR 22.848 | Interconnect of SNPN |
+| TR 22.851 | Network Sharing Feasibility Study |
+
+## Maintaining the Index
+
+```bash
+# Full rebuild
+python scripts/build_index.py
+
+# Incremental update (skips unchanged files)
+python scripts/build_index.py --update
+```
+
+## File Structure
+
+```
+skills/docs-rag/
+├── SKILL.md
+├── README.md          # this file
+├── assets/
+│   ├── workflow.puml
+│   └── docs-rag-workflow.svg
+├── data/
+│   └── index.json     # document index
+└── evals/
+    └── evals.json
+```
+
+## Evals
+
+```bash
+python scripts/run_evals.py docs-rag
+```

skills/docs-rag/assets/architecture.puml

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+@startuml docs-rag-architecture
+skinparam componentStyle rectangle
+skinparam defaultFontName Arial
+skinparam backgroundColor #FAFAFA
+
+package "docs-rag Skill" {
+  component "SKILL.md\n(instructions)" as SKILL
+  component "data/index.json\n(spec, title, keywords,\nsummary, file path)" as INDEX
+  component "evals/evals.json" as EVALS
+}
+
+package "Source Documents" {
+  database "docs/\n*.docx / *.doc\n(3GPP specs)" as DOCS
+  component "scripts/build_index.py\n(index builder)" as BUILDER
+}
+
+actor Developer
+
+Developer --> SKILL : 3GPP question
+SKILL --> INDEX : keyword + semantic match
+INDEX --> DOCS : read file (deep detail)
+BUILDER --> INDEX : builds / updates
+DOCS --> BUILDER : scans
+@enduml

skills/docs-rag/assets/workflow.puml

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+@startuml docs-rag-workflow
+skinparam defaultFontName Arial
+skinparam backgroundColor #FAFAFA
+
+actor Developer
+participant "docs-rag\nSkill" as SKILL
+participant "data/index.json" as INDEX
+participant "docs/*.docx" as DOCS
+
+Developer -> SKILL : 3GPP question
+SKILL -> INDEX : read index
+INDEX --> SKILL : entries (keywords, summary, path)
+SKILL -> SKILL : match query vs keywords & summary
+
+alt summary sufficient
+  SKILL --> Developer : answer from summary\n+ cite spec + version
+else need deeper detail
+  SKILL -> DOCS : read source file
+  DOCS --> SKILL : full spec content
+  SKILL --> Developer : detailed answer\n+ cite spec + version
+else no match
+  SKILL --> Developer : "No matching document found"
+end
+@enduml