Test/milestone repository queries

[AugistineCreates]

this pr closes #866

Description

This PR adds query methods (findMany and findById) to the MilestoneRepository and introduces a comprehensive query-behaviour test matrix in src/tests/milestoneRepository.queries.test.ts.

These changes support milestone listing, verifier assignment, and soft-deletes under strict organization scoping.

Key Changes

• MilestoneRepository:
  • Implemented findMany supporting keyset pagination (afterId, limit), soft-delete exclusion (filtered by default, optional via includeDeleted), verifier-assignment filtering (verifierUserId), and organization-scoping (orgId).
  • Implemented findById supporting organization-scoping and soft-delete filtering.
  • Fixed a TypeScript compiler warning by casting the raw database result in nearestNeighbors to any.
• Tests:
  • Created src/tests/milestoneRepository.queries.test.ts to assert that:
    • Keyset pagination is stable across concurrent inserts (no skipped/duplicated rows).
    • Soft-deleted milestones are excluded by default and includable explicitly.
    • Verifier-assignment filters return only the assigned verifier's milestones.
    • Every query path strictly enforces organization scoping.

Verification

• Verified TypeScript compilation:

  npx tsc --noEmit src/repositories/milestoneRepository.ts src/tests/milestoneRepository.queries.test.ts

• Checked that tests run and gracefully skip when DATABASE_URL is not configured, matching existing database test patterns.

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[1nonlypiece]

milestone repo query tests look thorough, merging