Implement BDEF v1.1 grading: scoring core, per-deck pipeline, ledger, dashboard, StartOS layer

- Deterministic scoring.py (quant 60 / qual 40 / flags -15, profitability heaviest)
- Per-company JSON ledger with forecast-target chaining deck N-1 -> N
- Single-shot sandbox agent with guided-JSON fallback ladder (no tool loop)
- Portfolio dashboard with sparklines, KPI hit rates, BDEF category bars
- 48 unit tests green; endpoints smoke-tested; npm check+build green

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

startos/interfaces.ts

@@ -13,8 +13,9 @@ export const setInterfaces = sdk.setupInterfaces(async ({ effects }) => {
     name: 'Web UI',
     id: 'webui',
     description:
-      'The Boardroom Map control panel: drop documents in, convene the reviewer ' +
-      'panel, watch the job run on your Sparks, and read the reports.',
+      'The Boardroom Map control panel: drop board decks into each company\'s ' +
+      'inbox, run the grading panel on your Sparks, and watch per-company ' +
+      'scorecard trends.',
     type: 'ui',
     username: null,
     path: '',