complexity-gate: harness package (Pi extension, Claude plugin, Codex skill, installer)

[ElbertePlinio]

Goal: @pickforge/complexity-gate package that installs the complexity-gate binary (github.com/pickforge/complexity-gate) and wires it into Claude Code, Codex, and Pi, mirroring packages/review-tutor.

Agent plan

Checklist:

• packages/complexity-gate: postinstall downloads the matching release binary (checksum-verified) into the package; bin forwards to it; COMPLEXITY_GATE_BIN override for local builds
• extensions/complexity-gate.ts (Pi): after edit/write tools → check <file> feedback; at turn end → check --changed, block/re-prompt while FAIL
• claude-plugin/ with hooks/hooks.json (PostToolUse Edit|Write|MultiEdit, Stop → complexity-gate hook claude) + skill; marketplace entry
• codex-skill/complexity-gate/SKILL.md + Codex hooks fragment
• skills/complexity-gate/SKILL.md
• complexity-gate-install --harness claude,codex,pi | --all | --print (interactive prompt when no flag)
• Tests: wrapper resolution, hook JSON fragments, extension handlers with a fake exec
• README
• PR/review

Validation:

• bun run typecheck && bun run lint && bun run test && bun run build
• Manual: install into all three harnesses on the maintainer machine; make a deliberately complex edit; observe block; refactor; observe release.

Current status: In progress
Next action: implementation lane

Binary: pickforge/complexity-gate#1

[ElbertePlinio]

Progress update:

• packages/complexity-gate: bin wrapper, checksum-verified postinstall downloader, complexity-gate-install (--harness, --all, --print, interactive), Pi extension, Claude plugin hooks + marketplace entry, Codex hooks fragment, skill mirrored to all three
• typecheck / lint / tests green (11 package tests, 696 total)
• Fixed downloader to read the binary from the cargo-dist archive directory (verified against a real dist build archive)
• Local install on all three harnesses + live runs (Claude/Codex running now; Pi after merge)
• PR

PR: pending
Blocked: none
Next: live runs → PR

[ElbertePlinio]

Merged in #88. Remaining: maintainer-machine wiring (Pi package path, canonical skill link, chezmoi), and the first binary release in pickforge/complexity-gate so postinstall can vendor the binary.