Merge upstream v2.34.0 with FastAPI pivot (v2.35.0)

Incorporate 42 upstream commits while preserving the Ruby/Rails → Python/FastAPI
pivot. Each of the 24 conflicting files was individually triaged.

Added: tiangolo-fastapi-reviewer, python-package-readme-writer, lint (Python),
pr-comments-to-todos, fastapi-style skill, python-package-writer skill.

Removed: 3 design agents, ankane-readme-writer, dhh-rails-reviewer,
kieran-rails-reviewer, andrew-kane-gem-writer, dhh-rails-style, dspy-ruby.

Merged: best-practices-researcher, kieran-python-reviewer, resolve_todo_parallel,
file-todos, workflows/review (pressure test), workflows/plan (reviewer names).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

plugins/compound-engineering/commands/workflows/plan.md

@@ -501,7 +501,7 @@ After writing the plan file, use the **AskUserQuestion tool** to present these o
 **Options:**
 1. **Open plan in editor** - Open the plan file for review
 2. **Run `/deepen-plan`** - Enhance each section with parallel research agents (best practices, performance, UI)
-3. **Run `/technical_review`** - Technical feedback from code-focused reviewers (DHH, Kieran, Simplicity)
+3. **Run `/technical_review`** - Technical feedback from code-focused reviewers (Tiangolo, Kieran-Python, Simplicity)
 4. **Review and refine** - Improve the document through structured self-review
 5. **Start `/workflows:work`** - Begin implementing this plan locally
 6. **Start `/workflows:work` on remote** - Begin implementing in Claude Code on the web (use `&` to run in background)