feat(apigatewayv2): strip summary-only fields from Create/Update

[vieiralucas]

Summary

• Product pages / rest endpoint pages store a pageTitle / endpoint string for the Smithy Summary shapes, but the Create/Update response shapes don't carry them. Stash them under _summary_* in storage and strip on response; list_subresources reads the stashed value.
• Translate incoming EndpointDisplayContent (None, Overrides) to the EndpointDisplayContentResponse (Body, Endpoint, OperationName) rather than echoing input.
• Lifts the apigateway probe baseline from 92.2% -> 95.6% and overall conformance from 99.6% -> 99.8%.

Stacked on top of #713. Merge that one first.

Test plan

• cargo test -p fakecloud-conformance --test apigatewayv2 (7 passing)
• cargo clippy --workspace --all-targets -- -D warnings (clean)
• cargo run -p fakecloud-conformance -- audit (PASS, 1702/1702)

---

Summary by cubic

Aligns API Gateway v2 extras with Smithy response shapes for Create/Update/Get and List. Stashes summary-only fields in storage, strips them from responses, translates inputs to the correct outputs, adds required defaults, and lifts conformance (apigateway 92.2% → 95.6%, overall 99.6% → 99.8%).

• Refactors
  • Product pages and REST endpoint pages: stash _summary_* fields; strip on Create/Update/Get; List projects to Summary shapes (PageTitle/Endpoint).
  • Translate EndpointDisplayContent to EndpointDisplayContentResponse (Body, Endpoint, OperationName); default Endpoint to page id when missing.
  • Build Portal/PortalProduct responses from known Smithy fields; drop unknown inputs.
  • Add defaults/required fields: IntegrationResponseKey/RouteResponseKey → $default; include DomainNameArn, ApiMappingSelectionExpression, RoutingMode; add RoutingRuleArn and default Priority; include MutualTlsAuthentication only if set; rename ListRoutingRules wrapper to RoutingRules; include model Description only when provided.

^{Written for commit 4169b63. Summary will update on new commits.}

[codecov]

Codecov Report

❌ Patch coverage is 0% with 36 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
crates/fakecloud-apigatewayv2/src/extras.rs	0.00%	36 Missing ⚠️

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[cubic-dev-ai]

1 issue found across 3 files

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="crates/fakecloud-apigatewayv2/src/extras.rs">

<violation number="1" location="crates/fakecloud-apigatewayv2/src/extras.rs:1073">
P2: `_summary_endpoint` is populated with the resource ID, so list summaries can return the wrong endpoint value.</violation>
</file>

_{Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.}