docs: update AGENTS.md and README.md for rules system, remove beads

- Add rules/ directory documentation to both files
- Update skill count from 25 to 15 modules
- Remove beads references (issue tracking removed)
- Update skills list with current active skills
- Document flake.nix as proper Nix flake (not flake=false)
- Add rules system integration section
- Clean up sisyphus planning artifacts
- Remove deprecated skills (memory, msteams, outlook)

skills/excalidraw/references/color-palette.md

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+# Color Palette & Brand Style
+
+**This is the single source of truth for all colors and brand-specific styles.** To customize diagrams for your own brand, edit this file — everything else in the skill is universal.
+
+---
+
+## Shape Colors (Semantic)
+
+Colors encode meaning, not decoration. Each semantic purpose has a fill/stroke pair.
+
+| Semantic Purpose | Fill | Stroke |
+|------------------|------|--------|
+| Primary/Neutral | `#3b82f6` | `#1e3a5f` |
+| Secondary | `#60a5fa` | `#1e3a5f` |
+| Tertiary | `#93c5fd` | `#1e3a5f` |
+| Start/Trigger | `#fed7aa` | `#c2410c` |
+| End/Success | `#a7f3d0` | `#047857` |
+| Warning/Reset | `#fee2e2` | `#dc2626` |
+| Decision | `#fef3c7` | `#b45309` |
+| AI/LLM | `#ddd6fe` | `#6d28d9` |
+| Inactive/Disabled | `#dbeafe` | `#1e40af` (use dashed stroke) |
+| Error | `#fecaca` | `#b91c1c` |
+
+**Rule**: Always pair a darker stroke with a lighter fill for contrast.
+
+---
+
+## Text Colors (Hierarchy)
+
+Use color on free-floating text to create visual hierarchy without containers.
+
+| Level | Color | Use For |
+|-------|-------|---------|
+| Title | `#1e40af` | Section headings, major labels |
+| Subtitle | `#3b82f6` | Subheadings, secondary labels |
+| Body/Detail | `#64748b` | Descriptions, annotations, metadata |
+| On light fills | `#374151` | Text inside light-colored shapes |
+| On dark fills | `#ffffff` | Text inside dark-colored shapes |
+
+---
+
+## Evidence Artifact Colors
+
+Used for code snippets, data examples, and other concrete evidence inside technical diagrams.
+
+| Artifact | Background | Text Color |
+|----------|-----------|------------|
+| Code snippet | `#1e293b` | Syntax-colored (language-appropriate) |
+| JSON/data example | `#1e293b` | `#22c55e` (green) |
+
+---
+
+## Default Stroke & Line Colors
+
+| Element | Color |
+|---------|-------|
+| Arrows | Use the stroke color of the source element's semantic purpose |
+| Structural lines (dividers, trees, timelines) | Primary stroke (`#1e3a5f`) or Slate (`#64748b`) |
+| Marker dots (fill + stroke) | Primary fill (`#3b82f6`) |
+
+---
+
+## Background
+
+| Property | Value |
+|----------|-------|
+| Canvas background | `#ffffff` |