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

skills/track-management/SKILL.md

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+---
+name: track-management
+description: Use this skill when creating, managing, or working with Conductor
+  tracks - the logical work units for features, bugs, and refactors. Applies to
+  spec.md, plan.md, and track lifecycle operations.
+metadata:
+  version: 1.0.0
+---
+
+# Track Management
+
+Guide for creating, managing, and completing Conductor tracks - the logical work units that organize features, bugs, and refactors through specification, planning, and implementation phases.
+
+## Use this skill when
+
+- Creating new feature, bug, or refactor tracks
+- Writing or reviewing spec.md files
+- Creating or updating plan.md files
+- Managing track lifecycle from creation to completion
+- Understanding track status markers and conventions
+- Working with the tracks.md registry
+- Interpreting or updating track metadata
+
+## Do not use this skill when
+
+- The task is unrelated to track management
+- You need a different domain or tool outside this scope
+
+## Instructions
+
+- Clarify goals, constraints, and required inputs.
+- Apply relevant best practices and validate outcomes.
+- Provide actionable steps and verification.
+- If detailed examples are required, open `resources/implementation-playbook.md`.
+
+## Resources
+
+- `resources/implementation-playbook.md` for detailed patterns and examples.