merge: resolve VERSION and CHANGELOG conflicts (accept both entries)

Main advanced with v0.12.5.1 (worktree parallelization in /plan-eng-review)
while this branch shipped v0.12.6.0 (sidebar URL fix). Both CHANGELOG entries
preserved in chronological order. VERSION keeps 0.12.6.0.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CHANGELOG.md

@@ -15,6 +15,14 @@ The Chrome sidebar agent used to navigate to the wrong page when you asked it to
 - **Pre-flight cleanup for `/connect-chrome`.** Kills stale browse servers and cleans Chromium profile locks before connecting. Prevents "already connected" false positives after crashes.
 - **Sidebar agent test suite (36 tests).** Four layers: unit tests for URL sanitization, integration tests for server HTTP endpoints, mock-Claude round-trip tests, and E2E tests with real Claude. All free except layer 4.
 
+## [0.12.5.1] - 2026-03-27 — Eng Review Now Tells You What to Parallelize
+
+`/plan-eng-review` automatically analyzes your plan for parallel execution opportunities. When your plan has independent workstreams, the review outputs a dependency table, parallel lanes, and execution order so you know exactly which tasks to split into separate git worktrees.
+
+### Added
+
+- **Worktree parallelization strategy** in `/plan-eng-review` required outputs. Extracts a structured table of plan steps with module-level dependencies, computes parallel lanes, and flags merge conflict risks. Skips automatically for single-module or single-track plans.
+
 ## [0.12.5.0] - 2026-03-26 — Fix Codex Hangs: 30-Minute Waits Are Gone
 
 Three bugs in `/codex` caused 30+ minute hangs with zero output during plan reviews and adversarial checks. All three are fixed.