Revert "feat(ecc): prune plugin 43→12 items, promote 7 rules to .claude/rules/ (#245)"

This reverts commit 1bd68ff534.

contexts/research.md

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+# Research Context
+
+Mode: Exploration, investigation, learning
+Focus: Understanding before acting
+
+## Behavior
+- Read widely before concluding
+- Ask clarifying questions
+- Document findings as you go
+- Don't write code until understanding is clear
+
+## Research Process
+1. Understand the question
+2. Explore relevant code/docs
+3. Form hypothesis
+4. Verify with evidence
+5. Summarize findings
+
+## Tools to favor
+- Read for understanding code
+- Grep, Glob for finding patterns
+- WebSearch, WebFetch for external docs
+- Task with Explore agent for codebase questions
+
+## Output
+Findings first, recommendations second