Add agent knowledge files for all modules

apps/clock/packages/shared/.agent/memory.md

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+# Clock Shared Package Memory
+
+This file tracks important decisions, patterns, and context about the Clock shared package.
+
+## Recent Changes
+
+_No changes recorded yet._
+
+## Important Decisions
+
+_No decisions recorded yet._
+
+## Known Issues
+
+_No issues recorded yet._
+
+## Future Considerations
+
+_No future items recorded yet._
+
+---
+
+**Note:** This memory file will be populated as changes are made to the shared package. Use it to track:
+- Breaking changes and migration notes
+- Deprecated types or constants
+- Design decisions and rationale
+- Cross-package coordination notes