Implement Model Context Protocol (MCP) server #1926

[ck3960250]

Implement Model Context Protocol (MCP) server #1926.

This PR implements an MCP adapter for the Golem CLI with HTTP and SSE transports.
It cleanly wraps the existing CLI commands into MCP tools without duplicating business logic, and adds manifest.resources discovery to introspect golem.yaml/golem.yml configurations for agents.

E2E Test Verification:

    Finished `test` profile [unoptimized + debuginfo] target(s) in 11.74s
     Running tests/lib.rs (target/debug/deps/integration-73e5ff943b576eb5)

Running 1 tests

[1/1] Running test: integration::mcp_server::mcp_server_starts_and_responds_to_health_check
[1/1] Finished test: integration::mcp_server::mcp_server_starts_and_responds_to_health_check [PASSED]

test result: ok; 1 passed; 0 failed; 0 ignored; 0 measured; 96 filtered out; finished in 6.620s

cc @jdegoes @Lu-Gru

[github-actions]

✅ All contributors have signed the CLA.
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[ck3960250]

I have read the CLA Document and I hereby sign the CLA

[ck3960250]

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[ck3960250]

Hi @jdegoes, I've implemented the MCP adapter with SSE support and verified it with E2E tests (see logs above). CLA has been signed. Ready for your review!

[ck3960250]

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[ck3960250]

I have read the CLA Document and I hereby sign the CLA

[ck3960250]

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[ck3960250]

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[vigoo]

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