Add workstation skill library with categories and tags

[naiam-studio]

Summary

Add a Unix-like organized skill library under .workstation/skills/ with:

• 13 category directories with symlink-based references
• YAML frontmatter tags for filtering (Markdown_TAG compatible)
• workstation-navigation meta-skill for optimal search protocol
• 31 incorporated skills capturing repo-specific wisdom and practices
• Reference in AGENTS.md and CLAUDE.md for agent discovery

Motivation

Agents need a fast, organized way to find relevant skills without reading every SKILL.md file. The library uses Unix-like directory structure where categories contain symlinks to canonical sources, making it trivial to add new skills or create custom views.

Structure

.workstation/skills/
├── all/           → 59 symlinks (everything)
├── for-agents/    → 59 symlinks (agent-useful subset)
├── incorporated/  → 31 symlinks (skills we created)
├── sources/       → canonical content (worldforge/, gentle-ai/, incorporated/)
├── codex/         → 7 symlinks (WorldForge project skills)
├── sdd/           → 11 symlinks (SDD workflow skills)
├── review/        → 7 symlinks (review patterns)
├── docs/          → 4 symlinks (documentation skills)
├── testing/       → 10 symlinks (testing patterns)
├── provider/      → 5 symlinks (provider skills)
├── security/      → 1 symlink (security skills)
├── convention/    → 7 symlinks (conventions)
├── workflow/      → 3 symlinks (workflow skills)
├── git/           → 6 symlinks (git/PR skills)
└── config/        → 3 symlinks (config files)

Changes

File	Change
.workstation/README.md	Top-level docs (dynamic, no counts)
.workstation/skills/README.md	Full catalog docs (dynamic, no counts)
.workstation/skills/sources/incorporated/	31 canonical skill directories
.workstation/skills/sources/worldforge/	7 WorldForge project skills
.workstation/skills/sources/gentle-ai/	21 Gentle AI global skills
.workstation/skills/all/	59 symlinks to every skill
.workstation/skills/incorporated/	31 symlinks to incorporated skills
.workstation/skills/for-agents/	59 symlinks (superset)
.workstation/skills/config/	symlinks to config files
AGENTS.md	Added .workstation/ reference in Documentation Map
CLAUDE.md	Added .workstation/skills/ in structure, layering, and skills

Test Plan

• All symlinks are relative (portable within repository)
• No broken symlinks (verified with find -xtype l)
• Ruff check passed (no Python files in .workstation)
• AGENTS.md updated with .workstation reference
• CLAUDE.md updated with .workstation reference