Merge upstream origin/main (v2.60.0) with fork customizations preserved

Incorporates 78 upstream commits while preserving all local fork intent:
- Keep deleted: dhh-rails, kieran-rails, dspy-ruby, andrew-kane-gem-writer (FastAPI pivot)
- Merge both: ce-review (zip-agent-validator + design-conformance-reviewer wiring),
  kieran-python-reviewer (upstream pipeline + FastAPI conventions),
  ce-brainstorm/ce-plan/ce-work (upstream improvements + deploy wiring checks),
  todo-create (upstream template refs + assessment block),
  best-practices-researcher (upstream rename + FastAPI refs)
- Accept remote: 142 remote-only files, plugin.json, README.md
- Keep local: 71 local-only files (custom agents, skills, commands, voice)

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

plugins/compound-engineering/skills/todo-resolve/SKILL.md

@@ -30,6 +30,8 @@ Create a task list grouped by type (e.g., `TaskCreate` in Claude Code, `update_p
 
 ### 3. Implement (PARALLEL)
 
+**Do NOT create worktrees per todo item.** A worktree or branch was already set up before this skill was invoked (typically by `/ce:work`). All agents work in the existing single checkout — never pass `isolation: "worktree"` when spawning agents.
+
 Spawn a `compound-engineering:workflow:pr-comment-resolver` agent per item. Prefer parallel; fall back to sequential respecting dependency order.
 
 **Batching:** 1-4 items: direct parallel returns. 5+ items: batches of 4, each returning only a short status summary (todo handled, files changed, tests run/skipped, blockers).