test: remove implementation-coupled checks

[morluto]

Summary

Remove tests that checked source layout, schema inventories, catalog wording, or synthetic tool selection rather than observable product contracts.

Keep the useful behavior checks at their owner boundaries:

• use a local Streamable MCP server for the DeepWiki adapter tests, allowing removal of its production-only callTool hook;
• check the source-audit workflow through its MCP response rather than its hard-coded constructor;
• retain the executable runtime-contract command while removing its unreachable duplicate CLI route and service contract.

Persistence, ordering, side-effect, schema-upgrade, MCP schema/annotation, and real stdio-protocol tests remain.

Validation

• make verify

Review order

1. internal/deepwiki/client.go and internal/deepwiki/client_test.go
2. Runtime-contract deletions across the app, CLI, and contracts packages
3. Remaining test-only cleanup in the corpus and MCP server suites

[cursor]

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