Update PR description with completed work and checklist status

[Copilot]

The user requested the PR description be updated to reflect completed work and fill in the prerequisite/submission checklists.

Changes

Updated PR description to document:

• Core infrastructure (50+ files): Agent definitions with required headings, validation script with automated test suite, CI/CD workflow, append-only logs (specs.md, decisions.md, agent_runs.md), central registry (agents.yaml), platform-agnostic documentation
• Task governance scaffolding: Traits (pr-authorship-clarity, pr-review-automation), workflows (pr-review-and-merge), task tracking (cadence.yaml, triage.md, wip.md)
• Validation status: All automated tests passing (agent format, unique IDs, tags, append-only files, markdown structure)

Filled checklists:

• Prerequisites: ✅ Tests (validation script), ✅ Linting (validation checks), ✅ Code sanitization (conventions followed), ⬜ Issue reference (foundational PR, no prior issue)
• Submission: ✅ Contribution guidelines (established), ✅ No duplicate PRs, ✅ Tests passing, ⬜ Reviewer assignment (pending)

The description now provides scan-friendly summary of the AgentFactory template structure and compliance status.

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