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

@@ -0,0 +1,67 @@
+# 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
+```