hotfix: fix readonly color variable collision in pulse-session-helper.sh

[marcusquinn]

Summary

• Fixes runtime error readonly variable when running aidevops pulse status (and other pulse-session-helper.sh commands)
• Root cause: config-helper.sh (added in PR fix: replace mandatory session gate with layered consent model for pulse #2943 follow-up) sources shared-constants.sh which declares color variables as readonly. The script then tried to redeclare them.
• Fix: use ${VAR+x} parameter expansion to only define colors when not already set by shared-constants.sh

Verified

$ bash .agents/scripts/pulse-session-helper.sh status
Pulse Status
────────────
  Pulse:       enabled via session flag (aidevops pulse start)
  Consent layers:
    Stop flag:      clear
    Session flag:   active (2026-03-06T01:38:08Z by marcusquinn)
    Config consent: enabled

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• .agents/scripts/pulse-session-helper.sh

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🔍 Code Quality Report

�[0;35m[MONITOR]�[0m Code Review Monitoring Report

�[0;34m[INFO]�[0m Latest Quality Status:
SonarCloud: 0 bugs, 0 vulnerabilities, 108 code smells

�[0;34m[INFO]�[0m Recent monitoring activity:
Fri Mar 6 03:07:00 UTC 2026: Code review monitoring started
Fri Mar 6 03:07:01 UTC 2026: SonarCloud - Bugs: 0, Vulnerabilities: 0, Code Smells: 108

📈 Current Quality Metrics

• BUGS: 0
• CODE SMELLS: 108
• VULNERABILITIES: 0

Generated on: Fri Mar 6 03:07:03 UTC 2026

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