[codex] Add Effect lint skills and diagnostics

[RhysSullivan]

Summary

• add executor lint rules for Effect-native error handling, schema/value-inferred types, promiseExit handlers, package boundaries, and test style
• add agent skills referenced by diagnostics so lint findings point at concrete fix guidance
• enable the baseline rules in oxlint config

Notes

• This PR intentionally contains only the baseline rules, skills, and lint wiring. Codebase cleanups are split into follow-up PRs stacked on this branch so agents can use the new rules while keeping reviews small.

Validation

• Not run yet; split baseline only.

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commit: b039b6e