Replace uv version --no-sync with direct in-place file edits for version bumps

[Copilot]

uv version --no-sync skips virtualenv sync but still runs the resolver, requiring network access and risking partial state (e.g. pyproject.toml rewritten, uv.lock not) on transient failures.

Changes

• update_pyproject_version(path, target_version) — regex-patches the version field directly in the [project] section of pyproject.toml, anchored to that section to avoid false matches elsewhere:

  pattern = re.compile(r'(?ms)(\[project\](?:(?!\n\[).)*?\n)(version = ")([^"]+)(")')

• update_uv_lock_version(path, package_name, target_version) — patches the version line in the matching [[package]] block of uv.lock using the invariant [[package]]\nname = "..."\nversion = "..." format generated by uv:

  pattern = re.compile(
      r'(?m)(^\[\[package\]\]\nname = "' + re.escape(package_name) + r'"\nversion = )"([^"]+)"'
  )

• cmd_set / cmd_bump — both run_command(["uv", "version", ...]) calls replaced with the above functions. No uv subprocess is invoked; version bumps are now fully offline and atomic at the file level.

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