chore: release v5.8.4

Author: avifenesh

.claude-plugin/marketplace.json

@@ -1,7 +1,7 @@
 {
   "name": "agentsys",
   "description": "19 specialized plugins for AI workflow automation - task orchestration, PR workflow, slop detection, code review, drift detection, enhancement analysis, documentation sync, unified static analysis, perf investigations, topic research, agent config linting, cross-tool AI consultation, structured AI debate, workflow pattern learning, codebase onboarding, and contributor guidance",
-  "version": "5.8.3",
+  "version": "5.8.4",
   "owner": {
     "name": "Avi Fenesh",
     "url": "https://github.com/avifenesh"

.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "agentsys",
-  "version": "5.8.3",
+  "version": "5.8.4",
   "description": "Professional-grade slash commands for Claude Code with cross-platform support",
   "keywords": [
     "workflow",

CHANGELOG.md

@@ -9,6 +9,19 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [5.8.4] - 2026-04-20
+
+### Fixed
+- **tasks.json atomic optimistic locking** (#331) - Concurrent `/next-task` and `/ship` runs could silently lose claims or leave stale registry entries due to unguarded read-modify-write on `tasks.json`. Fix uses `_version` + per-write `_writerId` optimistic locking (mirrors existing `flow.json` pattern): write atomically via rename, re-read and verify both fields match before declaring success, retry up to 5× with jitter on mismatch.
+- **tasks.json schema unification** - `worktree-manager` wrote `{ version, tasks[] }` while `workflow-state.js` read `{ active }`, causing claim exclusion in `discover-tasks` to always return an empty set. Unified schema is `{ active, tasks[], _version, _writerId }` with on-read normalization of both legacy formats — no migration needed.
+- **Silent corruption risk** - `readTasks()` now throws on corrupted JSON instead of returning a safe default, preventing `updateTasks` from silently overwriting potentially recoverable data.
+- **Agent prompt raw file writes** - `worktree-manager` Phase 6 and Cleanup Reference replaced inline `fs.writeFileSync` with `workflowState.claimTask()` / `workflowState.releaseTask()` library calls that are atomic and retry-safe.
+
+### Added
+- `updateTasks(mutatorFn)` - optimistic-lock loop for `tasks.json` mutations (mirrors `updateFlow`)
+- `claimTask(entry, projectPath)` - atomic upsert into `tasks[]` registry for worktree-manager
+- `releaseTask(taskId, projectPath)` - atomic removal from `tasks[]` registry for ship/abort; idempotent
+
 ## [5.8.3] - 2026-04-11
 
 ### Fixed

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "agentsys",
-  "version": "5.8.3",
+  "version": "5.8.4",
   "description": "A modular runtime and orchestration system for AI agents - works with Claude Code, OpenCode, and Codex CLI",
   "main": "lib/platform/detect-platform.js",
   "type": "commonjs",

package.json

@@ -5,7 +5,7 @@
     "url": "https://agent-sh.github.io/agentsys",
     "repo": "https://github.com/agent-sh/agentsys",
     "npm": "https://www.npmjs.com/package/agentsys",
-    "version": "5.8.3",
+    "version": "5.8.4",
     "author": "Avi Fenesh",
     "author_url": "https://github.com/avifenesh"
   },