chore(validation): speed up pre-push checks

[jSydorowicz21]

Summary

Switches local pre-push validation from a repo-wide full gate to changed-file checks for formatting and ESLint. The full repo validation remains available as bun run validate:push:full or by setting MAESTRO_FULL_PUSH_VALIDATE=1 before pushing.

Why

The previous .husky/pre-push path ran repo-wide Prettier, all TypeScript project checks, all ESLint, and the full Vitest suite on every push. That made normal branch pushes slow enough to time out during issue-triage work, even after targeted tests had already passed.

Changes

• Added scripts/validate-push-fast.ts to derive changed files from Git pre-push stdin, with manual-run fallback for committed, staged, unstaged, and untracked files.
• Updated validate:push to call the fast validator by default.
• Added validate:push:full for the previous full repo gate using bun run.
• Updated Husky hooks to use bunx instead of npx for staged-file checks.
• Preserved delete-only push skipping in .husky/pre-push.

Validation

• bun scripts/validate-push-fast.ts
• bun run validate:push:fast
• bunx prettier --check --ignore-unknown .husky/pre-push .husky/pre-commit .husky/pre-merge-commit package.json scripts/validate-push-fast.ts
• git diff --check
• Synthetic pre-push stdin piped into bun scripts/validate-push-fast.ts
• Synthetic pre-push stdin piped into sh .husky/pre-push
• Delete-only synthetic pre-push stdin piped into sh .husky/pre-push
• Real git push -u fork fix/fast-local-validation, which ran the fast hook successfully

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