chore(deps): refresh to latest and add Bun 1.4.2 CI - #2

Fixes #1

Changes:

• Migrate @mariozechner/pi-* to @earendil-works/pi-* (0.87.1 exact)
• Refresh devDependencies: @biomejs/biome 2.5.14, typescript 7.0.2, vitest 5.0.1, @types/node 26.6.2, @typescript/native-preview 7.0.0-dev.20260707.2
• Node.js engine: >=22.19.0
• Add .github/workflows/ci.yml: Bun 1.4.2, matrix (ubuntu/macos × node 22/24)
• Update biome.json preset (migrate from deprecated recommended)
• Fix test file formatting per Biome 2.5.14
• Update README: git distribution only
• Bump version to 0.1.1, add CHANGELOG entry

Local gates (all green):

• bun install --frozen-lockfile ✓
• bun run check ✓
• bun run test (39 tests) ✓
• npm ci && npm test ✓

Summary by cubic

Refreshes all toolchain dependencies, migrates the pi peer dependencies to their new package naming, and adds CI coverage with Bun 1.4.2.

Dependencies

• Bump @biomejs/biome to 2.5.14, typescript to 7.0.2, vitest to 5.0.1, and @types/node to 26.6.2.
• Replace @mariozechner/pi-ai and @mariozechner/pi-coding-agent with @earendil-works/pi-ai and @earendil-works/pi-coding-agent (0.87.1).
• Require Node.js >=22.19.0.

CI

• Add a workflow that runs checks and tests with Bun 1.4.2 on Node 22 and 24 across Ubuntu and macOS, plus a separate npm consumer job.

^{Written for commit e5b1919. Summary will update on new commits.}