chore: release v4.0.0 - sync 550+ skills and restructure docs

skills/debugging-strategies/SKILL.md

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+---
+name: debugging-strategies
+description: Master systematic debugging techniques, profiling tools, and root cause analysis to efficiently track down bugs across any codebase or technology stack. Use when investigating bugs, performance issues, or unexpected behavior.
+---
+
+# Debugging Strategies
+
+Transform debugging from frustrating guesswork into systematic problem-solving with proven strategies, powerful tools, and methodical approaches.
+
+## Use this skill when
+
+- Tracking down elusive bugs
+- Investigating performance issues
+- Debugging production incidents
+- Analyzing crash dumps or stack traces
+- Debugging distributed systems
+
+## Do not use this skill when
+
+- There is no reproducible issue or observable symptom
+- The task is purely feature development
+- You cannot access logs, traces, or runtime signals
+
+## Instructions
+
+- Reproduce the issue and capture logs, traces, and environment details.
+- Form hypotheses and design controlled experiments.
+- Narrow scope with binary search and targeted instrumentation.
+- Document findings and verify the fix.
+- If detailed playbooks are required, open `resources/implementation-playbook.md`.
+
+## Resources
+
+- `resources/implementation-playbook.md` for detailed debugging patterns and checklists.