chore(verification): stage 6 cleanup — docs, refactor, audit comment

[bokelley]

Summary

Cleanup follow-ups after #3524 shipped (Stages 1-5). No wire-format changes; brand.json output is byte-for-byte identical to what shipped in #3604.

What ships

1. Docs update — docs/building/aao-verified.mdx

Last updated for the orthogonal-axes framing in #3536; didn't mention the per-version model that just shipped. Added:

• New "Per-version badges" section explaining (agent, role, AdCP version) as the badge identity, parallel-version badges, and how the legacy vs version-pinned URLs differ.
• Display section documents both URL shapes with examples (/badge/{role}.svg auto-upgrade and /badge/{role}/{version}.svg version-pinned), plus the corresponding embed endpoints.
• JWT claim block adds adcp_version and explicit verifier guidance: "verifiers MUST check adcp_version against the AdCP version they care about" — closes the cross-version replay concern raised in Stage 2's security review.
• brand.json enrichment subsection documents the aao_verification.badges[] array, the roles[] / modes_by_role deprecation policy, and the AdCP 4.0 removal target.

2. Refactor — extract buildAaoVerificationBlock for testability

Code-review nit on PR #3604: the shaping logic was a closure inside the brand.json route handler — unreachable from unit tests. Extracted to services/aao-verification-enrichment.ts as a pure function. The route handler keeps the JSON traversal and assignment.

14 new unit tests cover:

• Empty input → null
• Single-badge build
• Multi-version dedupe with caller-ordering preserved
• The "buyer pinned to 3.0 sees the wrong contract" footgun (modes_by_role flattens; badges[] doesn't)
• adcp_version shape filtering as defense in depth (DB CHECK is the real gate, but a hand-edited row or replication slot replay shouldn't leak)
• Leading-zero-major rejection, full-semver rejection, double-digit minor preservation
• Deprecation notice content invariants

3. PROTOCOL_LABELS audit comment — dashboard-agents.html

DX expert nit from #3603: the \${protocol} Agent\${versionSegment} label construction relies on PROTOCOL_LABELS values not ending in "Agent" (otherwise we'd get "Media Buy Agent Agent 3.1"). Added a comment pinning the invariant so a future contributor adding a new protocol doesn't break it accidentally.

What this PR does NOT do

• Panel role-grouping (Verification panel: role-grouping and 'show all versions' disclosure when an agent holds 4+ badges #3603's main item) explicitly defers until parallel-version badges land in production with real buyer feedback. Designing the layout against synthetic data would be premature.
• Wire-format changes — none. brand.json output is byte-for-byte identical.

Test plan

• 14 new unit tests for buildAaoVerificationBlock
• 145/145 unit tests pass total (was 131)
• TypeScript typecheck clean
• Pre-commit hook green (image quality, etc.)

Stage tracker (for context)

#3524 fully shipped:

• ✓ Stage 1 (feat(verification): per-major-version badge data model (#3524 stage 1) #3568) — data model
• ✓ Stage 2 (feat(verification): per-version heartbeat fan-out + JWT adcp_version (#3524 stage 2) #3579) — heartbeat fan-out + JWT
• ✓ Stage 3 (feat(verification): badge SVG version segment + version-pinned URLs (#3524 stage 3) #3595) — SVG version segment + version-pinned URLs
• ✓ Stage 4 (feat(verification-panel): per-version badge rows (#3524 stage 4) #3600) — verification panel per-version rows
• ✓ Stage 5 (feat(verification): brand.json + /verification per-version detail (#3524 stage 5) #3604) — brand.json + /verification detail
• ✓ Stage 6 (this PR) — docs + testability + audit comment

Open follow-up: #3603 (panel role-grouping, "show all versions" disclosure) — deferred until we have parallel-version data.

🤖 Generated with Claude Code