chore(deps): replace chalk with picocolors

[roli-lpci]

Summary

• Replace chalk (4 transitive deps: chalk, ansi-styles, supports-color's dep has-flag) with picocolors (zero deps) for terminal color output
• Map new chalk.Instance(support) to picocolors.createColors(!!support) — supports-color returns false for no-support and {level: 1|2|3} for support, so the boolean coercion preserves the same enable/disable semantics
• All colors used (red, green, yellow, cyan, gray) are basic ANSI codes, so the level-to-boolean mapping has no visual impact
• Normalize chalk.grey to picocolors.gray (both emit ANSI code 90)
• Eliminate the manual identity-function fallback branch — createColors(false) handles this automatically

Changes

• src/formatter/get_color_fns.ts — Replace chalk.Instance + bind pattern with picocolors.createColors, simplify from 46 lines to 30
• features/support/warn_user_about_enabling_developer_mode.ts — Replace chalk.red() with pc.red()
• package.json — Swap chalk for picocolors in dependencies
• package-lock.json — Regenerated

Notes

• supports-color is intentionally kept — it is used by src/publish/publish_plugin.ts outside of the chalk context
• Prior chalk v5 upgrade PR (fix(deps): update dependency chalk to v5 #1914) was closed — chalk v5 is ESM-only while cucumber-js has CJS exports. Picocolors supports both CJS and ESM.

Testing

• 408 unit tests passing
• TypeScript build clean
• Prettier clean
• ESLint clean
• dependency-lint clean