Summary

• Replace chalk (136KB + deps) with picocolors (3.8KB, zero deps) for terminal color output
• All chained style calls converted to function composition (e.g. chalk.red.bold(x) → pc.red(pc.bold(x)))
• chalk.grey mapped to pc.gray, chalk.blueBright mapped to pc.blueBright

Changes

• package.json: swap chalk dep for picocolors
• src/applyPatches.ts: replace chalk usage (heaviest file — error messages, warnings, status output)
• src/createIssue.ts: replace chalk.bold
• src/detectPackageManager.ts: replace chalk error formatting
• src/index.ts: replace chalk in help text
• src/makePatch.ts: replace chalk progress indicators and error messages
• src/makeRegExp.ts: replace chalk error formatting
• src/patch/read.ts: replace chalk error formatting
• src/rebase.ts: replace chalk status and error messages
• src/stateFile.ts: replace chalk info messages

Testing

• TypeScript compilation: zero errors
• Unit tests: all passing (467 tests across 9 suites)
• Integration tests: pre-existing failure unrelated to this change (same on master)

Addresses #499