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/ce-plan/SKILL.md

@@ -47,6 +47,7 @@ Every plan should contain:
 - Existing patterns or code references to follow
 - Enumerated test scenarios for each feature-bearing unit, specific enough that an implementer knows exactly what to test without inventing coverage themselves
 - Clear dependencies and sequencing
+- **Deploy wiring check**: If the feature adds new env vars to backend config (`config.py`, `settings.py`, or similar), the plan MUST include explicit tasks for updating deploy values files (e.g. `values.yaml` for Helm, `.env.*` files, Terraform vars). This is not a follow-up — the feature is not done until deploy config is wired. See `docs/solutions/deployment-issues/missing-env-vars-in-values-yaml.md`.
 
 A plan is ready when an implementer can start confidently without needing the plan to write the code for them.