* test(mcp): move the MCP OAuth happy path from a live Linear e2e to an integration test
GitHub Actions now runs unit tests only, and the MCP OAuth happy path needed a
captured Linear browser login to click through a real consent page. The OAuth
flows it exercised are already integration tests against an owned
authorization-server double, except one behavior: the stored per-user token
must be served by a proxy process that never saw the consent, with no shared
Redis to fall back on. That case is now in test_mcp_oauth_flows.py
The e2e test, its owned-gateway helper, its workflow, the mcp_oauth_live marker
and the JUnit gate script only that workflow used are removed
* test(mcp): chat completions run an OAuth server tool with the caller's own stored token
* test(e2e): drop the Linear chat-completion MCP OAuth e2e and its helpers
The behavior it checked, a chat completion running an OAuth server's tool with
the caller's stored per-user token, is now an integration test in
test_mcp_llm_endpoints.py that needs no saved Linear browser login
* test(mcp): decode the stored per-user credential as urlsafe base64
The plaintext check used b64decode, which drops the - and _ of a urlsafe value
and raised on roughly one ciphertext in five
* test(mcp): drop the chat OAuth integration test that duplicates test_mcp_slots F2-chat
security/test_mcp_slots.py already sends a per-user OAuth token through
/v1/chat/completions and asserts the peer receives it. Every mutant the new test
killed was also killed by the existing suite, so it added no signal
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