Merge step (c): converge to ce-* convention for agents and skills

Aligns local custom agents, skills, and modified shared agents with upstream's
flat ce-<name>.agent.md + ce-<skill>/ convention introduced in upstream v3.x.

Changes:
- Delete 9 upstream-renamed agents for locally-dropped agents (design/*, rails
  reviewers, ankane-readme-writer, data-migration-expert, performance-oracle,
  security-sentinel)
- Delete ce-dhh-rails-style skill (local dropped dhh-rails-style entirely)
- Move 5 custom agents to flat ce-<name>.agent.md paths:
  * python-package-readme-writer, design-conformance-reviewer,
    tiangolo-fastapi-reviewer, zip-agent-validator, lint
- Rename 12 custom skill directories with ce- prefix:
  * john-voice, jira-ticket-writer, hugo-blog-publisher, weekly-shipped,
    proof-push, ship-it, story-lens, sync-confluence, excalidraw-png-export,
    python-package-writer, fastapi-style, upstream-merge
- Port local Python/FastAPI edits into upstream's flat ce-best-practices-
  researcher.agent.md and ce-kieran-python-reviewer.agent.md
- Update frontmatter name: fields in all 17 renamed files to match new paths

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

plugins/compound-engineering/skills/ce-john-voice/references/signature-moves.md

@@ -0,0 +1,57 @@
+# John's Signature Moves
+
+## The "Not What You Think" Correction
+
+Sets up a received wisdom, then reveals what's actually underneath. The inversion is the essay.
+
+> "Many believe buildings in DC cannot be taller than the White House. The rule is actually based on the road the building adjoins."
+
+> "The birth rate isn't falling because married women stopped having children. It's falling because fewer women are getting married in the first place."
+
+> "The appliances didn't free time; they redefined our standards of what 'clean enough' meant."
+
+---
+
+## The Lateral Analogy
+
+Builds through parallel examples from unrelated domains until a shared principle becomes undeniable. Two examples is a comparison. Three is a pattern.
+
+> Crosscut saws → mechanical watches → mechanical keyboards → *therefore* manual cars will thrive as a niche.
+
+> Vacuum cleaner → washing machine → dishwasher → *therefore* AI won't free your time either.
+
+---
+
+## The Parenthetical Aside
+
+A secondary observation tucked in parentheses — a dry qualifier, a confession, or the best joke in the paragraph. It rewards close readers without slowing anyone else down.
+
+> *(dodged the extraterrestrial lifeforms)*
+
+> *(and will probably never go)*
+
+> *(which are likely closer to 200 miles in reality)*
+
+Use parentheses, never em-dashes. The parenthetical slips in; the em-dash announces itself.
+
+---
+
+## The Rhetorical Pivot
+
+A question that advances the argument rather than decorating it. Often used as a structural bookend — asked at the start, answered by the end.
+
+> "What makes a city beautiful?" — opens the essay and recurs mid-piece.
+
+> "Does owning an EV keep you from embarking on long road trips?"
+
+> "Why is this memory the one that's faded the least?"
+
+---
+
+## The Sensory Stack
+
+When the reader needs to be *there*, enumerate specific sensory channels in sequence. Not impressionistic atmosphere — each detail is unique to the exact scene.
+
+> "I hear the engine increase in its frothy fury, I feel the seat press back against me, I see the landscape start to blur slowly and then suddenly quickly, I stamp the clutch in, feel a sense of weightlessness..."
+
+> "The greenness of the vegetation and the blueness of the sky. I remember how the flowering jasmine smells. The vibrations of the small, but mighty, engine chattering through the steering wheel."