[codex] Clean up MCP Effect error handling

[RhysSullivan]

Summary

• preserve typed MCP connector/auth failures instead of laundering them through one local error
• translate connection-access failures at the MCP HTTP boundary with stable user-facing messages
• switch MCP edit save to promiseExit and replace manual Option tag checks with public helpers

Validation

• bun run --cwd packages/plugins/mcp typecheck
• bun run --cwd packages/plugins/mcp vitest run

Notes

• Stacked on the baseline lint/skills PR so the new rules and skills are available while reviewing this diff.
• Targeted lint for the edited files still reports the existing MCP extension inferred-type backlog; that is left for its own PR.

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commit: 6a6d205

[RhysSullivan]

Closing as superseded by newer focused MCP cleanup PRs, including #557, #560, #593, #650, #658, and #681.