feat(scaffold): x-altair-webhook round-trip activation (#189)#192
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Activate the x-altair-webhook OpenAPI extension end-to-end, mirroring the x-altair-idempotency playbook (#175): - Forward emit: OpenApiEmitter::renderWebhook() writes the extension when a spec carries a webhook block. direction + signing always travel; every other field is omitted when it equals its WebhookSpec default, keeping the block minimal and byte-stable across the round-trip gate. - Reverse import: OperationMapper::webhookFromExtension() reconstructs the webhook: spec block, copying through only the non-default keys so the Parser re-applies the same defaults. - Drift gate: OpenApiRoundtripRunner compares x-altair-webhook in both the projection and the per-extension drift loop. A dropped/changed block now fails openapi:roundtrip with kind extension_drift. - Centralized WebhookSpec defaults into named constants so emit / parse / round-trip share one source of truth (no literal drift). - Expanded docs/openapi/extensions/x-altair-webhook.schema.json from the reserved 4-field stub to the full round-tripping contract. - Docs: extensions.md + roundtrip.md move webhook from "carried through" to "round-trips" and into the compared-set listing. Tests: 7 new cases covering inbound + outbound emit, default omission, reverse import, clean round-trip (both directions), and a real broken-emitter proving the drift gate fires. Regenerated .agent scaffold manifest. Closes #189
tonydspaniard
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This was referenced Jun 1, 2026
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