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

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

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+---
+name: simplify-code
+description: Systematic code simplification using proven refactoring patterns. Apply incrementally with tests at each step.
+---
+
+# Simplify Code
+
+Lean-mode simplification contract optimized for low token usage.
+Detailed pattern catalog and examples are in [APPENDIX.md](./APPENDIX.md).
+
+## Execution Workflow
+
+### 1. Setup
+- Detect build and test commands from project files.
+- If missing, ask user once and store commands.
+- Build candidate file list from git-visible files only:
+  - prefer `git ls-files` for tracked + unignored files
+  - include untracked-but-unignored files when relevant (`git ls-files --others --exclude-standard`)
+  - NEVER simplify files ignored by `.gitignore` (or `.git/info/exclude` / global gitignore)
+  - if workspace is not a git repo, ask user for include paths before modifying files
+
+### 2. Baseline Validation
+- Run build; if failing, STOP.
+- Run tests; if failing, STOP.
+
+### 3. Prepare Tooling
+- Detect and run formatter/linter appropriate for the language.
+- Keep edits style-compliant before simplification passes.
+
+### 4. Simplification Passes
+- Prioritize largest or most complex files first (within the git-visible candidate list).
+- Apply one refactoring pattern at a time.
+- Keep behavior unchanged.
+
+### 5. Verify
+- Re-run build and tests after each pass or grouped pass.
+- If failures appear, go to failure handling.
+
+### 6. Failure Handling
+- Generate `simplification-report.md` with:
+  - files touched
+  - patterns applied
+  - failures and diagnostics
+  - rollback guidance
+
+## Detection Triggers
+
+Target code that shows one or more of:
+- long methods / large classes
+- nested or complex conditionals
+- duplicate logic
+- magic numbers
+- ambiguous naming
+- long parameter lists
+- dead code / commented code
+- impure stateful helpers
+
+## Core Patterns
+
+Apply these patterns first:
+1. Extract Method
+2. Guard Clauses
+3. Decompose Conditional
+4. Replace Magic Number with Constant
+5. Rename for clarity
+6. Remove dead/commented code
+7. Introduce parameter object when argument lists are large
+
+Prefer pure functions and immutability where idiomatic for the language.
+
+## Constraints
+
+- Avoid large-bang refactors.
+- Keep each change small and reversible.
+- Do not change public behavior unless explicitly requested.
+- Do not introduce speculative abstractions.
+- Do not read, modify, or propose edits for files ignored by git ignore rules.
+
+## Metrics (Targets)
+
+- Cyclomatic complexity `< 10`
+- Method length `< 30` lines
+- Nesting depth `< 4`
+- Parameter count `< 4`
+- Class length `< 300` lines
+
+## Language Notes
+
+- Use ecosystem formatters/linters (Prettier/ESLint, Black/isort, gofmt, etc.).
+- Follow project-native naming conventions.
+- Prefer readability over cleverness.
+
+## Quick Mapping
+
+- Long method → Extract Method
+- Nested conditionals → Guard Clauses + Decompose Conditional
+- Duplicate code → Extract shared helper
+- Magic numbers → Named constants
+- Dead code → Remove
+
+## Reference
+
+For expanded examples and anti-pattern details, see [APPENDIX.md](./APPENDIX.md).