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/json-schema.md

@@ -0,0 +1,71 @@
+# Excalidraw JSON Schema
+
+## Element Types
+
+| Type | Use For |
+|------|---------|
+| `rectangle` | Processes, actions, components |
+| `ellipse` | Entry/exit points, external systems |
+| `diamond` | Decisions, conditionals |
+| `arrow` | Connections between shapes |
+| `text` | Labels inside shapes |
+| `line` | Non-arrow connections |
+| `frame` | Grouping containers |
+
+## Common Properties
+
+All elements share these:
+
+| Property | Type | Description |
+|----------|------|-------------|
+| `id` | string | Unique identifier |
+| `type` | string | Element type |
+| `x`, `y` | number | Position in pixels |
+| `width`, `height` | number | Size in pixels |
+| `strokeColor` | string | Border color (hex) |
+| `backgroundColor` | string | Fill color (hex or "transparent") |
+| `fillStyle` | string | "solid", "hachure", "cross-hatch" |
+| `strokeWidth` | number | 1, 2, or 4 |
+| `strokeStyle` | string | "solid", "dashed", "dotted" |
+| `roughness` | number | 0 (smooth), 1 (default), 2 (rough) |
+| `opacity` | number | 0-100 |
+| `seed` | number | Random seed for roughness |
+
+## Text-Specific Properties
+
+| Property | Description |
+|----------|-------------|
+| `text` | The display text |
+| `originalText` | Same as text |
+| `fontSize` | Size in pixels (16-20 recommended) |
+| `fontFamily` | 3 for monospace (use this) |
+| `textAlign` | "left", "center", "right" |
+| `verticalAlign` | "top", "middle", "bottom" |
+| `containerId` | ID of parent shape |
+
+## Arrow-Specific Properties
+
+| Property | Description |
+|----------|-------------|
+| `points` | Array of [x, y] coordinates |
+| `startBinding` | Connection to start shape |
+| `endBinding` | Connection to end shape |
+| `startArrowhead` | null, "arrow", "bar", "dot", "triangle" |
+| `endArrowhead` | null, "arrow", "bar", "dot", "triangle" |
+
+## Binding Format
+
+```json
+{
+  "elementId": "shapeId",
+  "focus": 0,
+  "gap": 2
+}
+```
+
+## Rectangle Roundness
+
+Add for rounded corners:
+```json
+"roundness": { "type": 3 }
+```