spec: docs dashboard accuracy overhaul (spec 553)

[Muizzkolapo]

Summary

Spec documenting 6 data accuracy bugs in the agac docs dashboard and a 3-phase fix plan.

The dashboard shows a static config view, not an operational view. It reads YAML but ignores runtime artifacts (manifest, run results, event logs).

P0 — Data is wrong

• Action count: shows 43 (YAML), should show 52 (runtime, with version expansion)
• Workflow status: shows "paused", should show "completed" (from manifest)
• Levels: shows "0 stages", should show 36 (from manifest)
• Runs: shows 0, but run_results.json exists (wrong file path)
• Logs: shows 0 errors, but event files exist (wrong file path)

Fix plan

• Phase 1: Read manifest, expand versions, fix file path scanning
• Phase 2: Surface runtime data (per-action metrics, dispositions, prompt traces)
• Phase 3: UI fixes (settings page, tool nav, empty sparklines)