[cschanhniem]

Implements A3 from NEXT_100_PR_MAP.

What

• src/openamp_foundry/cli/commands/first_run_report.py: build_first_run_report() reads demo_ranked.jsonl, evidence/, demo_report.md, run_manifest.json; graceful when outputs missing; enforces claim boundary notice in every report
• tests/cli/test_first_run_report.py: 63 tests in 7 classes
• BASELINE: 8473 → 8536

Disconfirming pass

• No safety gates modified
• Report is read-only: reads existing outputs, writes nothing
• Claim boundary notice is non-removable from output
• Gracefully handles missing outputs without crashing