[Repo Assist] eng: add Dependabot for GitHub Actions + v3 OperationCompiler unit tests

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Summary

Two improvements in one PR:

Task 4 — Engineering Investments: Dependabot for GitHub Actions

Adds .github/dependabot.yml to enable automated weekly dependency update PRs for GitHub Actions versions. This means the CI actions (actions/checkout, actions/setup-dotnet, actions/cache) will get automated PRs when new versions are released, keeping CI up to date without manual tracking.

Task 9 — Testing Improvements: v3 OperationCompiler unit tests

Adds tests/SwaggerProvider.Tests/v3/Schema.OperationCompilationTests.fs with 9 new unit tests for the v3 OperationCompiler pipeline:

Test	What it verifies
Simple GET generates correctly named method	operationId → method name mapping
No-param GET has CT as sole parameter	CT injection with no API params
Task(string) return for JSON string response	Return type resolution
Required params before optional ones	Parameter ordering
CT is always the last parameter	CT position invariant
POST body param precedes CT	CT appended after body param
POST with 201/no-body → Task(unit)	Void return type
CT name deduplication	Unique naming when param is called cancellationToken
Multiple operations each get CT	Independence per-operation

These tests exercise the core OperationCompiler behaviour documented in repository memory and guard against regressions in parameter ordering and cancellation token injection.

Test Status

✅ Build: succeeded (0 errors, all warnings pre-existing)
✅ All 272 unit tests pass (0 failures, 2 pre-existing skips)
✅ Format check: Fantomas verified clean

Integration/provider tests require a running Swashbuckle server and were not run; the changes are purely additive (new test file + dependabot.yml).

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Protected files

• .github/dependabot.yml

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