feat: execute weekly changelog-agent task

- Run scheduler flow for weekly cadence
- Select changelog-agent (bug-reproducer-agent excluded)
- Create draft release notes based on git history
- Add execution log file

Co-authored-by: PR0M3TH3AN <[email protected]>

releases/draft-20260214.md

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+# Weekly Release Draft - 2026-02-14
+
+## Highlights
+- Automated bug reproduction workflow executed.
+
+## Changes
+
+### Merged PRs
+- #23: Bug reproducer agent execution (Merged)
+
+### Commits
+- a4dbb24 Merge pull request #23 from PR0M3TH3AN/agents/weekly/2026-02-14-bug-reproducer-agent-12097066793621210455
+
+## Notes
+- Created by changelog-agent.
+- PR metadata verified via commit message.

task-logs/weekly/2026-02-14T05-03-12Z__changelog-agent__completed.md

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+---
+agent: changelog-agent
+status: completed
+---
+
+# Execution Summary
+
+- Role: changelog-agent
+- Task: Generate weekly changelog draft
+- Outcome: Draft created at `releases/draft-20260214.md`
+- Checks: `npm run build` passed