ci: smoke-test framework adapter subpaths

[poyrazavsever]

What and why

Closes #148

The existing smoke tests resolve the core, testing and plugins entries, but do not check framework adapter exports. This adds package-name checks for next, express, hono, fastify, elysia and react-router in both CommonJS and ESM. Each check also verifies that the expected handler is a function.

The package-content step now requires every adapter's .js, .mjs and .d.ts artifacts. These checks use the existing Node 20/22/24 matrix. No runtime code, dependencies or public API changes.

Verification

• Package lint, typecheck and build passed.
• Unit/integration suite: 29 files, 464 tests passed.
• Executed the new workflow smoke block locally: all six adapters passed in both module formats.
• Executed the package-content block and npm pack --dry-run successfully.
• Negative checks using modified in-memory workflow commands rejected an unexported subpath, a missing handler and a missing artifact. No source/package metadata was changed for these checks.
• git diff --check and local vault/PR-safety checks passed.

Checklist

• Lint, typecheck and tests pass
• Positive and negative smoke checks cover the change
• No changeset needed (CI-only)
• No EN/TR docs or Since badge needed (no user-facing change)
• No credentials, card data or personal vault files

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