feat(training-agent): impairment tracking for media buys (closes #4719)

[bokelley]

Summary

When a creative referenced by a media buy's package transitions to rejected, the buy now surfaces health: "impaired" and an impairments[] entry per static/schemas/source/core/impairment.json. When the buyer recovers via assignment swap, the impairment clears and health returns to ok.

Closes the media_buy_seller/dependency_impairment and dependency_impairment_cardinality storyboards added in #4677/#4685 (both clean now, 12P + 19P = 31 steps passing on /sales).

Changes

• types.ts — Impairment interface + MediaBuyState.impairments?: Impairment[].
• comply-test-controller.ts — propagateCreativeImpairment(session, creativeId, prev, next) walks session.mediaBuys, finds buys with dependent packages, appends/removes impairment entries based on transition direction. Called from forceCreativeStatus after the status mutation. Idempotent on re-emission.
• task-handlers.ts:
  • handleGetMediaBuys mapper emits health ('impaired' iff impairments.length > 0, else 'ok') and impairments[] mapped to the wire shape.
  • handleUpdateMediaBuy recomputes mb.impairments after creative_assignments replacement — drops any creative-impairment whose resource_id is no longer referenced. This is the canonical recovery vector (assignment swap).
• tenants/comply.ts — creative_status adapter wired into the v6 /sales comply config. Was missing; storyboards previously reported force_scenario_unsupported.

Storyboard adjustments

Both dependency_impairment* storyboards originally used inline sync_creatives.assignments[] to bind the creative. The v6 SalesPlatform.syncCreatives(creatives, ctx) signature drops the request-level assignments[] — the platform has no surface for it (filed upstream at adcp-client#1842).

Both storyboards restructured to:

1. sync_creatives (library only, no assignment)
2. update_media_buy with packages[].creative_assignments

Both surfaces are equally canonical per the spec — this is a v6-SDK compatibility choice, not a deprecation. The impairment.coherence contract is identical regardless of binding path. Narrative in both scenarios updated to reflect this.

dependency_impairment_cardinality also needs bid_price: 10.0 on its packages because its brief lands on an auction pricing_option as products[0].pricing_options[0]. Filed test-design issue at #4732 for scenarios depending on pricing_options[0] discriminator.

Floors

• /sales: 72:340 → 74:380 (observed 75 clean, 398 steps)
• Other tenants unchanged — this PR only affects /sales

Reviewed by

• code-reviewer (no blockers, "ready to push")
• ad-tech-protocol-expert ("scenarios are spec-conformant"; narrative adjustments applied for canonical-surface framing)

Test plan

• bash scripts/run-storyboards-matrix.sh — all 6 tenants pass new floors
• npx tsc --noEmit -p server/tsconfig.json clean
• dependency_impairment: 12P/0S/0N/A
• dependency_impairment_cardinality: 19P/0S/0N/A
• Pre-commit (unit tests + typecheck) green at push time
• Pre-push storyboard matrix green at push time

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