feat: @adcp/client 5.1.0 + retire platform_type for capability-driven compliance

[bokelley]

Summary

• Bump @adcp/client to ^5.1.0
• Retire the AAO's platform_type concept end-to-end: MCP tool inputs, REST routes, DB schema, heartbeat, result rendering. Storyboard selection is now capability-driven (supported_protocols + specialisms from get_adcp_capabilities) — the protocol's own mechanism replaces our curated platform bundles
• Migration 409 drops agent_registry_metadata.platform_type; 410 adds version INTEGER NOT NULL DEFAULT 1 to adcp_state so the 5.1.0 putIfMatch / patchWithRetry primitives work against Postgres
• Storyboard loaders migrated: loadBundledStoryboards → listAllComplianceStoryboards, getStoryboardById → getComplianceStoryboardById. Test kits now live at compliance/cache/{version}/test-kits/
• evaluate_agent_quality output no longer includes the "Platform Coherence" section; coherence signals come from per-track results and advisory observations

Why this is breaking — and OK pre-3.0

5.1.0 is labeled minor but the 5.x surface is still pre-3.0. The platform_type input existed only because 5.0's ComplyOptions.platform_type drove curated bundle selection; 5.1.0 removed it in favor of the spec's specialisms. Keeping our platform_type as a shim would just shift the inconsistency elsewhere, so we retire it in one go.

Migrations run together: 409 drops the column after code stops reading it in the same release; 410 adds the state-store version column additively.

Test plan

• npx tsc --noEmit — clean on changes (two pre-existing ParsedRepo errors in member-tools unrelated to 5.1.0)
• npm run test:unit — 587 / 587 passed in precommit
• npx vitest run server/tests/unit/storyboards.test.ts server/tests/unit/mcp-eval-tools.test.ts — 36 / 36 passed. Pre-existing failures in comply-test-controller.test.ts and mcp-response-unwrap.test.ts are unrelated (verified by stashing)
• npx tsx scripts/generate-openapi.ts — regenerated, 11 lines removed for dropped platform_type fields
• Manual: run heartbeat against a live agent to verify capability-driven selection picks the right bundles (deploy to staging)
• Manual: confirm PUT /api/registry/agents/{url}/connect no longer accepts platform_type (caller audit — anyone who still sends it gets it ignored; they don't break)

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