docs: add package-level ROADMAP template

ROADMAP.package.md

@@ -0,0 +1,75 @@
+# @project/package Roadmap
+
+## Current Version: v0.0.0
+
+## v0.1.0 - Foundation
+
+**Status:** ⏳ Planned
+
+**Goal:** Brief description of what this version achieves.
+
+| Task | Status |
+|------|--------|
+| Setup package structure | [ ] |
+| Add base types/interfaces | [ ] |
+| Write unit tests | [ ] |
+| Build & verify | [ ] |
+
+---
+
+## v0.2.0 - Core Features
+
+**Status:** ⏳ Planned
+
+**Depends on:** v0.1.0
+
+| Task | Status |
+|------|--------|
+| Feature 1 | [ ] |
+| Feature 2 | [ ] |
+| Tests | [ ] |
+| Build & verify | [ ] |
+
+---
+
+## v0.3.0 - Enhanced Features
+
+**Status:** ⏳ Planned
+
+**Depends on:** v0.2.0
+
+| Task | Status |
+|------|--------|
+| Enhancement 1 | [ ] |
+| Enhancement 2 | [ ] |
+| Tests | [ ] |
+| Build & verify | [ ] |
+
+---
+
+## v1.0.0 - Stable Release
+
+**Status:** ⏳ Planned
+
+**Criteria:**
+- [ ] All planned features implemented
+- [ ] 90% test coverage
+- [ ] Documentation complete
+- [ ] No known bugs
+
+---
+
+## Version History
+
+| Version | Date | Description |
+|---------|------|-------------|
+| v0.0.0 | TBD | Initial setup |
+
+---
+
+## Template Usage
+
+1. Replace `@project/package` with actual package name
+2. Define milestones based on root ROADMAP.md
+3. Add specific tasks for this package
+4. Remove this section