Release v9.0.1

[dyoshikawa]

Release v9.0.1

This PR bumps the version to 9.0.1 in preparation for the release.

Changes since v9.0.0

All changes are internal chores and refactoring with no user-facing behavior changes.

• chore: resolve all knip findings (chore: resolve all knip findings #2058)
• chore: migrate from tsup to tsdown and drop ignoreDeprecations (chore: migrate from tsup to tsdown and drop ignoreDeprecations #2057)
• chore: use pnpm dlx instead of npx for ccstatusline statusline command (chore: use pnpm dlx instead of npx for ccstatusline statusline command #2056)
• refactor(rules): align GooseRuleSettablePaths with grokcli and drop unused excludeToolDir (refactor(rules): tidy GooseRule paths type and drop dead excludeToolDir #2054)

Full Changelog: v9.0.0...v9.0.1

[dyoshikawa]

@dyoshikawa Thank you!