Mem-Client: MDS Filenames Must Be kebab-case

New MDS filenames must be lowercase kebab-case.

Rationale:
- Consistent filename casing avoids cross-platform and readability issues.

Scope:
- PR review policy for new files under `domains/frontend/mem-client/src/mds/components/**`.

Trigger:
- A PR adds new files in scope.

Approval checks:
1) New filenames are lowercase kebab-case.
2) New filenames do not introduce uppercase letters or underscores.

Evidence:
- File names in diff conform to casing rule.

Decision:
- Return NOT APPROVED when trigger is met and filename casing is violated.