feat(SCOPONE-0010): vendor agent assets and clean docs

.github/skills/simplify-code/APPENDIX.md

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+# Simplify Code Appendix
+
+Extended examples and pattern notes live here to keep `SKILL.md` lean.
+
+## Pattern Details
+
+- Extract Method: split large functions into named units.
+- Guard Clauses: replace deep nesting with early returns.
+- Decompose Conditional: extract complex conditions and branches.
+- Replace Magic Numbers: promote literals to named constants.
+- Rename for Clarity: explicit, searchable, domain terms.
+- Remove Dead Code: delete commented or unreachable code.
+- Parameter Object: group related arguments when signatures are too long.
+
+## Language-Specific Reminders
+
+- JavaScript/TypeScript: prefer `const`, pure helpers, and array transforms.
+- Python: prefer clear names, type hints where useful, and small functions.
+- Java/C#: prefer focused classes and guard clauses.
+- Go: keep functions small, explicit error paths.
+
+## Anti-Patterns
+
+- Large-bang rewrites
+- Behavioral changes without explicit requirement
+- Premature abstractions
+- Clever code at cost of readability
+
+## Suggested Validation Loop
+
+1. Build/test baseline
+2. Apply one simplification pass
+3. Re-run build/tests
+4. Repeat
+
+If a pass introduces failures, stop and document in `simplification-report.md`.