Merge upstream origin/main with local fork additions preserved

Accept upstream's ce-review pipeline rewrite (6-stage persona-based
architecture with structured JSON, confidence gating, three execution
modes). Retire 4 overlapping review agents (security-sentinel,
performance-oracle, data-migration-expert, data-integrity-guardian)
replaced by upstream equivalents. Add 5 local review agents as
conditional personas in the persona catalog (kieran-python, tiangolo-
fastapi, kieran-typescript, julik-frontend-races, architecture-
strategist).

Accept upstream skill renames (file-todos→todo-create, resolve_todo_
parallel→todo-resolve), port local Assessment and worktree constraint
additions to new files. Merge best-practices-researcher with upstream
platform-agnostic discovery + local FastAPI mappings. Remove Rails/Ruby
skills (dhh-rails-style, andrew-kane-gem-writer, dspy-ruby) per fork's
FastAPI pivot.

Component counts: 36 agents, 48 skills, 7 commands.

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).