Address reviewer feedback and close design gaps

Key changes:
- Update milestones to v1.36/v1.37/v1.38
- Clarify sysfs reading: add GetCurrentHugepagesInfo() for fresh reads
  (GetMachineInfo() is cached at startup, would be stale)
- Add Integration with Topology Manager section with policy behavior table
- Add Interaction with CPU Manager section
- Address reserved hugepages (free_hugepages is correct metric)
- Expand race condition discussion with failure handling details
- Rewrite Story 2 as "Rapid Pod Churn" with clear timeline
- Add "Static policy only" note (None policy not applicable)
- Specify error message format with example
- Add kubelet restart behavior note
- Update Risks table with new mitigations
- Fix unit test description (removed nil reference)
- Update TOC with new sections
- Link enhancement issue #5759

Related: #5759

Author: srikalyan