Rewrite /deepen-plan with context-managed map-reduce (v3)

.claude-plugin/marketplace.json

@@ -12,7 +12,7 @@
     {
       "name": "compound-engineering",
       "description": "AI-powered development tools that get smarter with every use. Make each unit of engineering work easier than the last. Includes 29 specialized agents, 22 commands, and 19 skills.",
-      "version": "2.33.0",
+      "version": "2.34.0",
       "author": {
         "name": "Kieran Klaassen",
         "url": "https://github.com/kieranklaassen",

plugins/compound-engineering/.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "compound-engineering",
-  "version": "2.33.0",
+  "version": "2.34.0",
   "description": "AI-powered development tools. 29 agents, 22 commands, 19 skills, 1 MCP server for code review, research, design, and workflow automation.",
   "author": {
     "name": "Kieran Klaassen",

plugins/compound-engineering/CHANGELOG.md

@@ -5,6 +5,59 @@ All notable changes to the compound-engineering plugin will be documented in thi
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [2.34.0] - 2026-02-13
+
+### Changed
+
+- **`/deepen-plan` command** — Complete rewrite with **context-managed map-reduce** architecture to prevent context overflow. Validated across multiple real-world runs.
+
+  **Architecture:**
+  - Sub-agents write full analysis JSON to `.deepen/` on disk, return only a ~200-char completion signal to parent
+  - Parent context stays under ~13k tokens regardless of agent count (vs unbounded in v1)
+  - 10-phase pipeline: Analyze → Discover → Research (batched) → Validate → Judge (parallel per-section + merge) → Enhance → Quality Review → Preservation Check → Present
+
+  **Context Overflow Prevention (crash-tested):**
+  - **Batched agent launches** — Max 4 Task() agents pending simultaneously. Prevents session crash from simultaneous returns (anthropics/claude-code#11280, #8136)
+  - **200-char return cap** — Hard limit on agent return messages. All analysis lives in JSON files on disk
+  - **Task() failure recovery** — Retry once on silent infrastructure errors (`[Tool result missing due to internal error]`)
+
+  **Version Grounding:**
+  - Plan-analyzer reads lockfile → package.json → plan text (priority order) to resolve actual framework versions
+  - Prevents downstream agents from researching wrong library versions (e.g., MUI 5 when project uses MUI 7)
+  - `version_mismatches` field flags discrepancies between plan text and actual dependencies
+
+  **Per-Section Judge Parallelization:**
+  - Replaces single monolithic judge with parallel per-section judges + merge judge
+  - Section judges run in parallel (batched max 4), each deduplicates and ranks within its section
+  - Merge judge resolves cross-section conflicts, identifies cross-section convergence
+  - Reduced judge time from ~21 min to ~8-10 min in testing
+
+  **Two-Part Output Structure:**
+  - **Decision Record** (reviewer-facing): Enhancement summary, agent consensus, research insights, strong signal markers, fast follow items, verification checklist
+  - **Implementation Spec** (developer-facing): Clean, linear implementation guidance with ready-to-copy code blocks — no `// ENHANCED:` annotations or `(Rec #X)` references
+
+  **Quality Review (CoVe Pattern):**
+  - Post-enhancement agent checks for self-contradictions, PR scope assessment, defensive stacking, code completeness (undefined references), integration test gap detection, deferred items needing bridge mitigations
+  - Runs in isolated context — does not inherit enhancer's perspective
+
+  **Enhancer Improvements:**
+  - **Resolve conditionals** — Reads codebase to determine which implementation path applies, eliminates "if X use A, if Y use B" forks
+  - **Version verification** — Checks `frameworks_with_versions` before suggesting APIs (prevents ES2023+ suggestions for ES2022 targets)
+  - **Accessibility verification** — Ensures `prefers-reduced-motion` fallbacks don't leave permanent visual artifacts
+  - **Convergence signals** — `[Strong Signal — N agents]` markers when 3+ agents independently flag same concern
+  - **`fast_follow` classification** — Fourth action bucket for items with real UX impact but out of PR scope (must be ticketed before merge)
+
+  **Other Improvements:**
+  - `truncated_count` required field — Agents report omitted recommendations beyond 8-cap; judge weights convergence accordingly
+  - `learnings-researcher` integration — Single dedicated agent replaces N per-file learning agents
+  - Pipeline checkpoint logging to `.deepen/PIPELINE_LOG.md` for diagnostics
+  - Cross-platform safe: project-relative `.deepen/`, Node.js validation (no Python3 dependency)
+  - Architectural Decision Challenge phase with `project-architecture-challenger` agent
+  - `agent-native-architecture-reviewer` with dedicated skill routing
+  - PROJECT ARCHITECTURE CONTEXT block for all review/research agents
+
+---
+
 ## [2.33.0] - 2026-02-12
 
 ### Added