What's New in v2.2.2

Nuke Skill (/matrix:nuke) - Comprehensive codebase hygiene analysis across 11 categories:
- Structural detection (via new MCP tools): dead exports, orphaned files, circular dependencies
- Generative detection (AI judgment): unnecessary comments, commented-out code, console.log leftovers, overengineered deps, copy-paste duplication, stale TODOs
- 4 modes: scan (report only, default), this (single file), safe (high confidence only), aggressive (medium+)
- Confidence-tiered output: HIGH (>90%), MEDIUM (70-90%), LOW (<70%) with safety rules to prevent false positives
- 4-agent architecture: Structural, Dependency, Generative, Triage
matrix_find_dead_code MCP tool - Finds exported symbols with zero callers and orphaned files with no importers. Queries the code index DB directly.
matrix_find_circular_deps MCP tool - Builds import graph from the index and runs DFS cycle detection. Returns all circular dependency chains.
TaskCompleted hook - Detects significant completed tasks and suggests storing the solution via matrix_store.
Clone Repo skill (/matrix:clone-repo) - Shallow clone external repos to temp/ for exploration.

Review Skill - Detection Agent now includes full hygiene (nuke) scan on changed files. Distinguishes between issues introduced by the change vs pre-existing in touched files. Introduced console.logs → Tier 1, introduced unused imports/dead exports → Tier 2, pre-existing TODOs/comments → Tier 3.
Dynamic version - MCP server version now synced from package.json instead of hardcoded.
Memory safety - Regex pattern cache capped at 200 entries to prevent unbounded growth.

Session Modes - Removed the entire session mode system (ultrathink/quick/docs/debug/classic). Simplicity wins.
UserPromptSubmit hook - Removed per-prompt overhead. Claude Code already provides git context and CLAUDE.md natively.
PreCompact hook - Was a dead hook (couldn't output anything). Removed.
Stop hook - Replaced by the lighter TaskCompleted hook.
PostToolUse:Matrix hook - Removed nanny suggestions after matrix tool calls.
SubagentStop hook - Removed (no-op).
Auto-install file suggestion - No longer silently modifies ~/.claude/settings.json on session start.
minimal verbosity level - Two levels (full/compact) is enough.
Repomix tool - Replaced by /matrix:clone-repo skill (just clones to temp/, no dependency needed).
Skill Factory tools - Removed matrix_skill, matrix_skill_candidates, matrix_link_skill and all related code.
Export skill - Merged into /matrix:list (say "export" or "backup" to save JSON).

Previous Release

Swift & SwiftUI Skill (/swift-swiftui) - iOS/macOS dev patterns, @observable, MVVM/TCA, SwiftData
Effect-TS Skill (/effect-ts) - Typed errors, layers, concurrency, Schema, fp-ts migration