Add member work history and learning docs

docs/graph-discovery/README.md

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+# Graph Discovery
+
+Status: demo-backed / active
+
+Graph discovery owns how MongoDB records become the Team memory graph. It
+materializes a sparse, auditable graph from real records first, seeded graph
+second, and demo fallback third.
+
+## Files
+
+| File | Purpose |
+| --- | --- |
+| [`spec.md`](spec.md) | Source data, graph contract, and discovery rules |
+| [`policy.md`](policy.md) | Graph hygiene, evidence thresholds, and truthfulness |
+| [`prompt.md`](prompt.md) | Graph materialization and review prompt |
+| [`plan.md`](plan.md) | Risk-path and observatory build plan |
+
+## What Is Implemented Now
+
+- `GET /api/pods/:podId/graph`.
+- `GET /api/pods/:podId/graph/reach/:id` backed by MongoDB `$graphLookup`.
+- Live graph materialization from `pods`, `engineer_states`, `observations`,
+  `collisions`, `interventions`, and `outcomes`.
+- Seeded graph in `team_model.graph` and mirrored `graph_nodes` / `graph_edges`.
+- Demo graph fallback so the stage never shows an empty canvas.
+
+## What Is Intentionally Cut
+
+- A separate graph database.
+- A broad analytics dashboard.
+- Showing every historical event by default.
+- Treating seeded demo data as live learning.
+
+## Demo Proof Path
+
+Observe screen/git state -> detect collision -> send intervention -> accept or
+dismiss outcome -> recall similar event -> show changed graph or changed
+behavior.