feat: implement new claude skills and workflow

.claude/skills/decision-critic/README.md

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+# Decision Critic
+
+Here's the problem: LLMs are sycophants. They agree with you. They validate your
+reasoning. They tell you your architectural decision is sound and well-reasoned.
+That's not what you need for important decisions -- you need stress-testing.
+
+The decision-critic skill forces structured adversarial analysis:
+
+| Phase         | Actions                                                                    |
+| ------------- | -------------------------------------------------------------------------- |
+| Decomposition | Extract claims, assumptions, constraints; assign IDs; classify each        |
+| Verification  | Generate questions for verifiable items; answer independently; mark status |
+| Challenge     | Steel-man argument against; explore alternative framings                   |
+| Synthesis     | Verdict (STAND/REVISE/ESCALATE); summary and recommendation                |
+
+## When to Use
+
+Use this for decisions where you actually want criticism, not agreement:
+
+- Architectural choices with long-term consequences
+- Technology selection (language, framework, database)
+- Tradeoffs between competing concerns (performance vs. maintainability)
+- Decisions you're uncertain about and want stress-tested
+
+## Example Usage
+
+```
+I'm considering using Redis for our session storage instead of PostgreSQL.
+My reasoning:
+
+- Redis is faster for key-value lookups
+- Sessions are ephemeral, don't need ACID guarantees
+- We already have Redis for caching
+
+Use your decision critic skill to stress-test this decision.
+```
+
+So what happens? The skill:
+
+1. **Decomposes** the decision into claims (C1: Redis is faster), assumptions
+   (A1: sessions don't need durability), constraints (K1: Redis already
+   deployed)
+2. **Verifies** each claim -- is Redis actually faster for your access pattern?
+   What's the actual latency difference?
+3. **Challenges** -- what if sessions DO need durability (shopping carts)?
+   What's the operational cost of Redis failures?
+4. **Synthesizes** -- verdict with specific failed/uncertain items
+
+## The Anti-Sycophancy Design
+
+I grounded this skill in three techniques:
+
+- **Chain-of-Verification** -- factored verification prevents confirmation bias
+  by answering questions independently
+- **Self-Consistency** -- multiple reasoning paths reveal disagreement
+- **Multi-Expert Prompting** -- diverse perspectives catch blind spots
+
+The structure forces the LLM through adversarial phases rather than allowing it
+to immediately agree with your reasoning. That's the whole point.