fix: allow issue IDs to start with numbers

[dcramer]

The parseIssueId regex was too restrictive and rejected valid issue IDs that start with numbers (e.g., "3R-AUTOMATION-SYSTEM-3"). Updated the regex to accept alphanumeric characters at the start of project codes.

Also cleaned up duplicate tests while ensuring comprehensive coverage of all valid and invalid formats.

Fixes MCP-SERVER-E9E

Refs #317

🤖 Generated with Claude Code

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.89%. Comparing base (74abebb) to head (0cf6d8c).
Report is 8 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #365      +/-   ##
==========================================
+ Coverage   59.69%   59.89%   +0.20%     
==========================================
  Files          78       77       -1     
  Lines        6634     6635       +1     
  Branches      493      512      +19     
==========================================
+ Hits         3960     3974      +14     
+ Misses       2674     2661      -13     

Flag	Coverage Δ
evals	?
unittests	59.89% <100.00%> (+0.45%)	⬆️

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