feat(training-agent): implement provenance enforcement (provenance_requirements + accepted_verifiers + PROVENANCE_* codes)

[bokelley]

Closes #3777

Implements creative_policy.{provenance_required, provenance_requirements, accepted_verifiers} enforcement in the training agent so the creative_sales_agent/provenance_enforcement conformance storyboard passes (was failing 3 of 5 step validations).

Changes

handleGetProducts (task-handlers.ts)

Seeded products (from comply_test_controller seed_product) are now included in get_products responses via overlaySeededProducts. Previously only the static catalog was used. Seeded products that score zero on brief-mode keyword matching (they have no name/description by default) are prepended to the result so storyboard field_value checks on products[0].creative_policy.* pass.

handleSyncCreatives (task-handlers.ts)

Structural provenance enforcement derived from all seeded products' creative_policy. Checks run in spec order before persisting each creative:

1. Verifier allowlist (PROVENANCE_VERIFIER_NOT_ACCEPTED) — fires first per spec "cross-check before any outbound call" requirement; compares canonicalized verify_agent.agent_url against the accepted set
2. Presence (PROVENANCE_REQUIRED) — fires when provenance_required: true and no provenance object
3. Field-level (PROVENANCE_DIGITAL_SOURCE_TYPE_MISSING, PROVENANCE_DISCLOSURE_MISSING, PROVENANCE_EMBEDDED_MISSING) — gated on provenance_required: true per spec MUST-ignore rule for provenance_requirements when provenance_required is false/absent; short-circuits at first failure

Per-creative failures use action: 'failed' with errors[] (already in the sync-creatives-response.json schema enum; not persisted to session).

SyncCreativeResult type widened to include 'failed' and optional errors.

run-storyboards.ts

Removes creative_sales_agent/provenance_enforcement from KNOWN_FAILING_STORYBOARDS.

Non-breaking justification

Adds enforcement only when seeded products have provenance_required: true in creative_policy. Static catalog products have no such field. Sessions without seeded products are unaffected — hasProvenancePolicy is false and the enforcement block is a no-op. The action: 'failed' path was already defined in the schema.

Known simplification

sync_creatives has no product_id field, so per-product enforcement is not possible. acceptedVerifiers uses union semantics across all seeded products — documented in a code comment. In single-product storyboards (the typical case) union === intersection.

Out of scope / follow-up needed

• .github/workflows/training-agent-storyboards.yml thresholds (min_clean_storyboards, min_passing_steps) need a human bump after this merges — the routine cannot edit .github/**. The storyboard adds 4 steps (1 new clean storyboard).
• PROVENANCE_CLAIM_CONTRADICTED (truth-of-claim via get_creative_features against an on-list governance agent) is out of scope per the issue; the structural-rejection codes are sufficient to make the storyboard pass.

Pre-PR review

• code-reviewer: approved — no blockers; two nits noted above (provenance_requirements MUST-ignore rule fixed before this PR opened; accurate field path for watermarks vs embedded_provenance fixed before this PR opened)
• ad-tech-protocol-expert: approved — non-breaking per spec; enforcement logic, field paths, check ordering, and disclosure check condition all correct

Triage-managed PR. This bot does not currently iterate on
review comments or PR conversation threads (only on the source
issue). To unblock:

• Push fixup commits directly: gh pr checkout <num> →
  fix → push.
• Or re-trigger: comment /triage execute on the source
  issue.

See #3121
for context.

Session: https://claude.ai/code/session_013AgZkVzoaN9YBEJp3FeBk8

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