chore: repo bootstrap (license, AGENTS.md, package.json, tsconfig, biome, vitest)

[randomm]

What

Lay down the foundational files needed before any feature work begins. One PR, several small files. Mirrors randomm/pi-permissions (which converged on this layout after a full cycle of trial and error) and follows the Pi extension ecosystem majority pattern.

Files to create

LICENSE (new)

• Standard Apache License 2.0 text from https://www.apache.org/licenses/LICENSE-2.0.txt
• First line: Copyright 2026 randomm followed by a blank line, then the license text
• Plain ASCII, no smart quotes

package.json

Required fields:

• name: @randomm/pi-worktree
• version: 0.1.0
• license: Apache-2.0
• type: module
• keywords: pi-package, pi-extension, worktree, git, parallel
• pi: { extensions: [./index.ts] }
• peerDependencies: { @mariozechner/pi-coding-agent: * }
• files: [*.ts, README.md, LICENSE]
• Scripts: test (vitest run), test:coverage, lint (biome check .), format, typecheck (tsc --noEmit)
• devDependencies: @biomejs/biome ^1.9.4, @types/bun latest, typescript ^5, vitest ^2

Decide on src/ vs flat root early — pi-permissions uses flat root.

tsconfig.json

• strict: true
• noEmit: true
• target, module, moduleResolution, esModuleInterop, skipLibCheck configured for ESM/Bun
• NO outDir, declaration, rootDir (we ship raw .ts)

biome.json

Mirror randomm/pi-permissions biome.json directly.

vitest.config.ts

• v8 coverage provider
• Coverage thresholds 80/85 for security-critical modules
• Excludes node_modules, tests/

AGENTS.md (placeholder only)

Skeleton pointing to issue #6 for substantive content.

.gitignore

• node_modules/
• coverage/
• .worktrees/ ← critical for this plugin specifically
• Bun, OS, IDE patterns

bun.lock

Run bun install once after package.json is in place.

Why

pi-permissions burned a full session figuring out which files were needed and what pi.*, peerDependencies, keywords, license looked like in working form. Skip the rediscovery.

Acceptance criteria

• LICENSE present (Apache 2.0, copyright line at top)
• package.json contains: pi.extensions, peerDependencies[@mariozechner/pi-coding-agent]=*, license: Apache-2.0, keywords including pi-package and pi-extension, files allowlist, type: module
• tsconfig.json: strict + noEmit, no outDir/declaration
• biome.json mirrors pi-permissions
• vitest.config.ts present
• .gitignore includes .worktrees/
• bun install, bunx biome check ., bunx tsc --noEmit, bun test all run cleanly

Out of scope

• Source code (deferred to issue feat: worktree plugin #2)
• README content (covered in chore: README + CONTRIBUTING.md + issue templates #7)
• CI workflow (covered in chore: GitHub repo settings + CI workflow #5)
• AGENTS.md substantive content (covered in chore: AGENTS.md with worktree-safety section #6)