docs: Empirica integration proposal (.empirica/ awareness + context budget)

EMPIRICA_INTEGRATION.md

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+# Empirica Integration — PR Proposal
+
+## Summary
+
+Add `.empirica/` directory awareness to the scanner and dashboard, giving users
+visibility into their epistemic measurement data alongside existing config items.
+
+## What is Empirica?
+
+[Empirica](https://github.com/Nubaeon/empirica) is an epistemic measurement
+system for AI agents — tracks what AI knows, prevents action before understanding,
+compounds learning across sessions. Installs as a Claude Code plugin with 14 hooks,
+8 skills, and a statusline.
+
+When active, each project gets a `.empirica/` directory containing:
+- `sessions/sessions.db` — SQLite with vectors, findings, goals, calibration
+- `.breadcrumbs.yaml` — Session narrative and learning trajectory
+- `project.yaml` — Project config (name, type, domain)
+- `active_transaction*.json` — Active epistemic measurements
+
+## Proposed Changes
+
+### 1. Scanner: `scanEpistemics(scope)`
+
+Add to `scan()` Promise.all alongside existing scanners. Read-only filesystem
+discovery — no database queries, just presence detection and YAML/JSON metadata.
+
+```javascript
+async function scanEpistemics(scope) {
+  const items = [];
+  // Check for .empirica/ in project root
+  const empiricaDir = join(scope.repoDir, '.empirica');
+  // Read project.yaml for name/type/stats
+  // Check active_transaction*.json for open transactions
+  // Count session files for activity metric
+  return items;
+}
+```
+
+**New category:** `epistemic` with icon 📊
+
+**Items discovered per project:**
+- Project config summary (name, type, domain, status)
+- Session activity (count, last active)
+- Open transaction state (if any)
+- Calibration snapshot (from `.breadcrumbs.yaml` if present)
+
+### 2. Context Budget: Empirica overhead
+
+Add to budget calculation in `server.mjs`:
+- Empirica system prompt: ~1.2K tokens (lean) or ~6.3K tokens (full)
+- Plugin hooks: 14 hooks registered (loaded per-event, not all at once)
+- Skills available: ~30 tokens per skill description in skill list
+- Statusline: ~200 tokens per refresh cycle
+
+Detection: check for `empirica` in `~/.claude/plugins/local/` or
+`empirica-integration` (pre-1.7.0 name).
+
+### 3. Detail Panel: Epistemic summary
+
+When clicking an epistemic item:
+```
+📊 Empirica Project: empirica
+   Type: software | Domain: AI/ML
+   Sessions: 47 | Last active: 2h ago
+   Calibration: 0.28 (holistic)
+   Open goals: 12 | Findings: 1794
+   Transaction: open (praxic phase)
+
+   [View in CLI: empirica project-bootstrap]
+```
+
+### What this does NOT include
+
+- ❌ No dependency on Empirica being installed
+- ❌ No SQLite database queries
+- ❌ No real-time data streaming
+- ❌ No write operations to `.empirica/`
+- ❌ No Qdrant/vector store access
+
+Everything is filesystem metadata only.
+
+### Why this matters for organizer users
+
+1. **Visibility** — See which projects have epistemic tracking active
+2. **Token awareness** — Know Empirica's context budget cost (hooks + prompt)
+3. **Scope discovery** — `.empirica/` dirs show up in project scope tree
+4. **Cleanup** — Identify stale `.empirica/` dirs from old/abandoned projects
+5. **Complementary** — Organizer manages CONFIG, Empirica manages INTELLIGENCE
+
+### Symbiotic value
+
+The organizer shows WHERE things are. Empirica tracks WHAT you know.
+Together, users see both the configuration state and the intelligence
+state of their Claude Code environment in one dashboard.
+
+**Flow:** capture (empirica-extension) → process (empirica serve) →
+store (.empirica/) → visualize (organizer) → manage (scope, prune)
+
+### Implementation estimate
+
+- `scanner.mjs`: ~60 lines (new `scanEpistemics` function)
+- `server.mjs`: ~15 lines (context budget addition)
+- `app.js`: ~40 lines (detail panel template, icon, category)
+- `style.css`: ~5 lines (epistemic category color)
+- Tests: ~20 lines (scanner accuracy for `.empirica/` detection)
+- Total: ~140 lines, 0 new dependencies
+
+### Related projects
+
+- [Empirica](https://github.com/Nubaeon/empirica) — Epistemic measurement (MIT)
+- [Empirica Extension](https://github.com/Nubaeon/empirica-extension) — Chrome AI conversation capture
+- [Empirica Cortex](https://github.com/Nubaeon/empirica-cortex) — Intelligence serving layer (MCP)