refactor: move hunkdiff into packages/hunk

[benvinegar]

Summary

Move the published hunkdiff package into packages/hunk and turn the repository root into a private Bun workspace controller.

This is the first independently reviewable phase of the package-first monorepo migration. It replaces the all-in-one exploratory approach preserved in #994.

What changed

• moved application source, bin wrapper, and shipped skills under packages/hunk;
• moved the public hunkdiff manifest to packages/hunk/package.json while keeping the root private and orchestration-only;
• preserved hunkdiff/extension, hunkdiff/opentui, bin aliases, Pi skill discovery, and existing runtime behavior;
• retargeted TypeScript, dependency boundaries, tests, benchmarks, examples, docs, website, CI, Nix, installers, and source/prebuilt packaging;
• kept the repository-root CHANGELOG.md canonical through an explicit Changesets version wrapper and real Changesets integration test;
• added packed-package consumer checks for both public subpaths under NodeNext and Bundler resolution;
• added package-content checks for README/LICENSE/skills parity and private/workspace dependency leakage.

Scope and non-goals

This PR is intentionally mechanical:

• bundled Git, Jujutsu, and Sapling providers remain inside packages/hunk/src/extensions/default/vcs;
• no extension package identity was introduced;
• no enable/disable lifecycle or new extension commands were added;
• no provider package extraction or publication changes are included;
• no Turbo dependency was added.

Follow-up phases will handle those concerns separately after this PR lands.

Validation

Passed locally:

• bun run format:check
• bun run lint
• bun run typecheck
• bun run deps:check
• bun run knip
• bun run check:docs
• bun run check:changelog
• bun run changeset:status
• bun run test
• bun run test:session-broker-node
• bun run test:integration — 143 passed, 1 macOS-only skip
• bun run test:tty-smoke — 9 passed
• bun run check:pack
• bun run build:prebuilt:npm
• bun run check:prebuilt-pack
• bun run smoke:prebuilt-install
• bun run build:bin

The packed hunkdiff/extension and hunkdiff/opentui exports were validated under NodeNext and Bundler resolution. Independent fresh-context review returned ACCEPT with no blocker/high findings.

Not available locally:

• real Nix evaluation/build (focused Nix path tests passed);
• Firecracker install-VM execution.

This PR description was generated by Pi using gpt-5.6-sol

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1 Skipped Deployment

Project	Deployment	Actions	Updated
hunk-web	Ignored	Preview	Sep 6, 2026 1:34am UTC