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/deep-dive/assets/architecture.puml

@@ -0,0 +1,27 @@
+@startuml deep-dive-architecture
+skinparam componentStyle rectangle
+skinparam defaultFontName Arial
+skinparam backgroundColor #FAFAFA
+
+package "deep-dive Skill" {
+  component "SKILL.md\n(instructions + triggers)" as SKILL
+  component "assets/\nreport-template.md\n(11 section skeletons)" as TMPL
+  component "evals/evals.json" as EVALS
+}
+
+package "Input Sources" {
+  component "File path(s)\n(src/, docs/, manifests)" as FILES
+  component "URL\n(fetched content)" as URL
+  component "Pasted text /\nTopic name" as TEXT
+}
+
+package "Output" {
+  component "deep-dive-{subject}.md\n(structured report)" as REPORT
+}
+
+SKILL --> TMPL : loads 11-section template
+SKILL --> FILES : reads source files
+SKILL --> URL : fetches content
+SKILL --> TEXT : analyzes inline
+SKILL --> REPORT : writes report
+@enduml

skills/deep-dive/assets/report-template.md

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+# Deep Dive Report: {SUBJECT}
+
+> Generated by the `deep-dive` skill.
+> Date: {DATE}
+> Source: {SOURCE}
+
+---
+
+## 1. Overview
+
+- **What it is**: 
+- **Problem it solves**: 
+- **Target users**: 
+- **Design philosophy**: 
+- **Tech stack**: 
+
+---
+
+## 2. Architecture
+
+{description of high-level structure}
+
+```plantuml
+@startuml
+' Replace with actual components
+package "Layer A" {
+  [Component 1]
+}
+package "Layer B" {
+  [Component 2]
+  [Component 3]
+}
+[Component 1] --> [Component 2] : protocol
+[Component 2] --> [Component 3] : protocol
+@enduml
+```
+
+---
+
+## 3. Key Concepts & Terminology
+
+**Term** — definition and why it matters in this system.
+
+---
+
+## 4. Data Model
+
+{description of primary entities and relationships}
+
+```plantuml
+@startuml
+entity EntityA {
+  * id : UUID
+  --
+  field : Type
+}
+entity EntityB {
+  * id : UUID
+  --
+  field : Type
+}
+EntityA ||--o{ EntityB : relationship
+@enduml
+```
+
+---
+
+## 5. Core Flows & Sequences
+
+### Flow 1: {Name}
+
+{one-paragraph description}
+
+```plantuml
+@startuml
+actor User
+participant "Component A" as A
+participant "Component B" as B
+
+User -> A : action
+A -> B : call
+B --> A : response
+A --> User : result
+@enduml
+```
+
+---
+
+## 6. Public API / Interface Reference
+
+| Method | Path / Signature | Purpose | Key Params | Returns |
+|--------|-----------------|---------|------------|---------|
+| GET | /resource | description | param | type |
+
+**Auth**: {mechanism}
+
+---
+
+## 7. Configuration & Deployment
+
+**Key config options:**
+
+| Variable | Default | Description |
+|----------|---------|-------------|
+| `ENV_VAR` | value | what it controls |
+
+**Run locally:**
+```bash
+# minimal steps
+```
+
+**Deployment topology**: {description}
+
+---
+
+## 8. Extension & Integration Points
+
+- {plugin/hook/middleware description}
+- {how to add a new feature}
+- {external integration patterns}
+
+---
+
+## 9. Observability
+
+- **Logging**: 
+- **Metrics**: 
+- **Tracing**: 
+- **Health check**: 
+
+---
+
+## 10. Known Limitations & Trade-offs
+
+- {limitation or trade-off}
+
+---
+
+## 11. Further Reading
+
+1. **[Topic]** — why it matters and where to find it
+2. **[Topic]** — why it matters and where to find it
+3. **[Topic]** — why it matters and where to find it

skills/deep-dive/assets/workflow.puml

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+@startuml deep-dive-workflow
+skinparam defaultFontName Arial
+skinparam backgroundColor #FAFAFA
+
+actor Developer
+participant "deep-dive\nSkill" as SKILL
+participant "Input Source" as SRC
+participant "report-template.md" as TMPL
+
+Developer -> SKILL : "deep dive into X"\n(files / URL / topic / text)
+SKILL -> SRC : read files / fetch URL / analyze text
+SRC --> SKILL : raw material
+
+SKILL -> TMPL : load 11-section template
+SKILL -> SKILL : analyze architecture,\ndata model, flows, APIs
+
+loop each relevant section
+  SKILL -> SKILL : generate PlantUML diagram\n(component / ER / sequence)
+  SKILL -> SKILL : fill section content
+end
+
+SKILL --> Developer : deep-dive-{subject}.md
+@enduml