refactor: consolidate clang tooling

[baba-dev]

Summary

• replace the standalone clang-format, clang-tidy, and lint_autofix helpers with tools/clang_tools.sh
• update the Makefile along with README and docs/DEV_SETUP.md to document the new workflow
• drop the redundant scripts/format.sh wrapper and other legacy tooling

Testing

• npx --yes markdownlint-cli docs (fails: legacy lint violations in untouched files)
• npx --yes markdownlint-cli docs/DEV_SETUP.md
• ./tools/clang_tools.sh --help

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https://chatgpt.com/codex/tasks/task_e_68d05c9b68948324a63b31b7557833cd

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

[P1] Use tabs for fmt/tidy recipes

The newly updated fmt and tidy targets indent their command lines with eight spaces rather than a tab. Make requires a literal tab to begin each recipe line, so make fmt or make tidy now stops with “missing separator” before ./tools/clang_tools.sh executes. Swap the leading spaces for a tab as done in the surrounding targets.

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