ci: skip CI and release runs for agent-only changes

[zbeyens]

Why

Agent-only PRs, such as pstack syncs, ran the full CI suite (bun check: workflow check, lint, typecheck, all tests and the slowest tests) on the PR and check:push again on the merge, plus the release job on main, without touching any code those runs check.

What changed

• ci.yml no longer lists .agents/**, .claude/**, .codex/**, AGENTS.md, CLAUDE.md or skills-lock.json in its push and pull_request path filters.
• release.yml's push trigger ignores those same paths. GitHub skips a run only when every changed file matches, so a push that also changes code or adds a changeset still releases.
• pnpm check:workflow stays the local gate after a rule edit, as AGENTS.md and docs/development/agent-skills.md already say, and it still runs inside bun check whenever CI runs for other paths.

Verification

• The diff only removes six path entries twice from ci.yml and adds the same six as paths-ignore in release.yml.
• Not run: no agent-only PR has gone through the new triggers yet. This PR itself changes .github/workflows/**, so it still runs CI.

Shipped fast, no review.

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⚠️ No Changeset found

Latest commit: 12926ab

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Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	⚠️ Failed 2026-10-16T23:52:47.661323Z	12926ab	PR opened

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