Add pre-commit hooks and run them from format.sh

[hannahli-nv]

Summary

Adds pre-commit hooks to TileGym and wires them into format.sh, so contributors get consistent formatting on all file types (not just Python).

What's included

• .pre-commit-config.yaml — hooks:
  • trailing-whitespace, end-of-file-fixer (all text files)
  • check-yaml, check-json, pretty-format-json (--indent=2)
  • check-added-large-files
  • ruff-check (--fix) and ruff-format (Python), pinned to ruff 0.14.9 to match format.sh
• .github/workflows/pre-commit.yml — CI gate that runs the hooks on the files changed by each PR (so existing files aren't retroactively reformatted; only new/changed files are checked).
• format.sh — now installs and runs the pre-commit hooks before the existing SPDX-header and ruff steps, so bash format.sh applies everything in one command.

Why

ruff only formats/lints Python. Markdown, JSON, and YAML files currently have no automated formatting gate, so things like trailing whitespace, missing final newlines, or unsorted JSON can slip in. These hooks close that gap.

Note on skills/

Skill content under skills/ is excluded from the hooks. Each skill ships a signed skill.oms.sig; reformatting those files would invalidate the signature. Skills are validated and signed by the NVSkills pipeline, not hand-formatted.

CI Configuration

config:
  build: true
  # valid options are "ops" and "benchmark"
  test: []

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