refactor(contract-validator): extract skills from commands

Extract shared knowledge from 5 command files into 6 reusable skills:
- plugin-discovery.md: Plugin scanning and discovery
- interface-parsing.md: README.md and CLAUDE.md parsing
- dependency-analysis.md: MCP server and data flow analysis
- validation-rules.md: Compatibility and agent validation
- mcp-tools-reference.md: Available MCP tools
- visual-output.md: Standard formatting and headers

Slim commands from 263-164 lines down to 44-55 lines each.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

plugins/clarity-assist/skills/escalation-patterns.md

@@ -0,0 +1,57 @@
+# Escalation Patterns
+
+Guidelines for when to escalate between clarification modes.
+
+## Quick-Clarify to Full Clarify
+
+Escalate when quick-clarify reveals unexpected complexity:
+
+```
+"This is more involved than it first appeared - there are
+several decisions to make. Want me to switch to a more
+thorough clarification process? (Just say 'yes' or 'clarify')"
+```
+
+### Triggers for Escalation
+
+- Multiple ambiguities discovered during quick pass
+- User's answer reveals hidden dependencies
+- Scope expands beyond original understanding
+- Technical constraints emerge that need discussion
+- Conflicting requirements surface
+
+## Full Clarify to Incremental
+
+When user is overwhelmed by full 4-D process:
+
+```
+"This touches a lot of areas. Rather than tackle everything at once,
+let's start with [most critical piece]. Once that's clear, we can
+add the other parts. Sound good?"
+```
+
+### Signs of Overwhelm
+
+- Long pauses or hesitation
+- "I don't know" responses
+- Requesting breaks
+- Contradicting earlier answers
+- Expressing frustration
+
+## Choosing Initial Mode
+
+### Use /quick-clarify When
+
+- Request is fairly clear, just one or two ambiguities
+- User is in a hurry
+- Follow-up to an already-clarified request
+- Simple feature additions or bug fixes
+- Confidence is high (>90%)
+
+### Use /clarify When
+
+- Complex multi-step requests
+- Requirements with multiple possible interpretations
+- Tasks requiring significant context gathering
+- User seems uncertain about what they want
+- First time working on this feature/area