[codex] Add Effect lint skills and diagnostics

[RhysSullivan]

Summary

• add executor lint diagnostics that point agents at concrete Effect/style skills
• add and refine skills for typed Effect errors, schema/value-inferred types, promiseExit handlers, package boundaries, and test style
• codify boundary handling so lint fixes preserve behavior instead of replacing failures with fallback values
• include representative fixes and suppressions from agent probes to validate the guidance shape

Validation

• bun run --cwd packages/core/storage-core typecheck
• bun run --cwd packages/core/storage-core vitest run
• bunx oxlint -c .oxlintrc.jsonc packages/kernel/runtime-deno-subprocess/src/deno-subprocess-worker.mjs packages/core/cli/src/generators/index.ts packages/core/vite-plugin/src/index.ts scripts/oxlint-plugin-executor/rules/no-unknown-error-message.js --deny-warnings

Notes

• Draft PR because the broader changed-file lint run still surfaces known backlog in React and MCP plugin paths. Those failures are intentionally left visible for follow-up rule/skill iterations.

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[RhysSullivan]

Superseded by the split PR stack. Baseline rules/skills are in #535; cleanup changes are being opened as individual stacked draft PRs.