docs: add issue approval readiness checklist

[peterexcel494-oss]

Summary

Adds a comprehensive Issue Approval Readiness Checklist for Aegis SDK contributors, addressing all acceptance criteria from issue #113.

Changes

• docs/approval-readiness-checklist.md — New checklist document with six structured sections:

  1. Implementation Completeness — scope alignment, acceptance criteria coverage, no placeholder logic
  2. Testing Expectations — happy-path and failure-mode coverage, mock client usage, no-test justification for docs-only changes, npm run verify gate
  3. CI Status Expectations — all GitHub Actions checks green, Node 20/22 matrix, build/lint/compat pass
  4. Acceptance Criteria Review — traceability table requirement, per-criterion evidence, deferred items tracked
  5. Documentation — API reference, README, guides updated as needed
  6. Known Limitations — edge cases documented, follow-up issues linked
  • Contributor Self-Review Summary checklist
  • "Merged Does Not Mean Evaluated" section explicitly stating merge ≠ reward eligibility or campaign completion
  • Related documentation links

• README.md — Added "Issue Approval Readiness" subsection in Contributing with a direct link to the new checklist and a callout that a merged PR is still subject to evaluation.

Acceptance Criteria

Criterion	Satisfied by
Approval readiness checklist is added	docs/approval-readiness-checklist.md created with all 6 sections
Checklist states merged PRs are still subject to evaluation	"Merged Does Not Mean Evaluated" section + README callout
Testing expectations are included	Section 2: Testing Expectations
CI status expectations are included	Section 3: CI Status Expectations
Acceptance criteria review is included	Section 4: Acceptance Criteria Review
README links to the checklist	README.md Contributing > Issue Approval Readiness

Closes #113

[peterexcel494-oss]

l have work on the issues but not showing PR on my dashboard and not yet giving point
but showing me completed pls kindly review