docs: add efficiency-levers setup and current-run instructions

- PROJECT_STATE.md: section on three deployed levers (FK annotations, context-pack, recap v2)
  with setup instructions for new workspaces; psd pre-configured
- README.md: one-time setup for workspace (tht schema suggest-fks); note that levers 2+3 auto-activate
- Updated 'How to run' with explicit command and prereq checklist
- Last-updated timestamp: 2026-07-08

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

harness/README.md

@@ -65,6 +65,27 @@ tht lsh build        -c /path/to/tht-workspace-<customer>/<customer>.yaml
 tht session new      -c /path/to/tht-workspace-<customer>/<customer>.yaml
 ```
 
+## Efficiency levers setup (one-time per workspace)
+
+To enable the three deployed optimization levers on a **new workspace**:
+
+```bash
+# Lever 1: Foreign key suggestions from approved SQL + heuristics.
+# Run once after schema introspection to populate annotations.yaml.
+tht schema suggest-fks \
+  --from-sql /path/to/customer/sessions \
+  --assume cod_paz=dim_patient \
+  -c /path/to/customer/workspace.yaml \
+  --write
+
+# (psd workspace: 228 FK suggestions already generated via this command 2026-07-08)
+
+# Levers 2 + 3: automatic at next session (context-pack + recap from ledger).
+# No setup needed — SKILL.md prescribes them automatically.
+```
+
+See `PROJECT_STATE.md` for what each lever does.
+
 ## The workflow
 
 `workflow.yaml` is the **single source of workflow truth** (spec F2). Eight phases