fix: wait for CI checks to register before polling for completion

[gms1]

Problem

When a PR is first created, GitHub Actions may not have registered any checks yet, so statusCheckRollup is empty. The existing completion loop in step3_merge_pr() interpreted an empty rollup as "all checks passed" and merged prematurely.

This caused PR #39 to be merged before CI checks had completed.

Fix

Added a Phase 1 polling loop that waits for at least one CI check to appear in statusCheckRollup (5-minute timeout) before entering the Phase 2 completion loop. This ensures we never treat an empty check rollup as "all passed."

Complements the earlier fix (PR #36) that handled false-negatives from skipped/neutral checks.

Changes

• tools/bin/maintenance.sh: Added Phase 1 startup polling in step3_merge_pr()
• memory-bank/progress.md: Documented the fix
• memory-bank/activeContext.md: Updated current work

[coderabbitai]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (7b0d9e4) to head (0ea6797).

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #40   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            8         8           
  Lines          344       344           
=========================================
  Hits           344       344           

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