[plan] Reduce workflow log noise on successful runs

[github-actions]

Objective

Identify and silence/resolve redundant error and warning emitters in successful workflow runs to improve signal-to-noise ratio.

Context

Recent successful runs show unacceptably high error/warning counts:

• Run §20337316176: 113 errors
• Run §20337284655: 19 errors, 16 warnings

This noise creates alert fatigue and masks real issues.

Approach

1. Download and analyze logs from the top 3 noisiest successful runs
2. Identify the specific steps/commands generating the most errors/warnings
3. Categorize noise sources:
   • False positives (can be suppressed)
   • Fixable issues (should be addressed)
   • Expected warnings (should be documented/accepted)
4. Implement fixes:
   • Add appropriate flags to silence non-critical output
   • Fix underlying issues where feasible
   • Document accepted warnings in workflow comments

Files to Investigate

• .github/workflows/*.yml - Workflow definitions
• .github/workflows/*.md - Workflow source files
• Action logs from runs 20337316176, 20337284655, and other noisy successes

Acceptance Criteria

• Root causes of top error/warning sources identified and documented
• Successful runs show <10 errors/warnings total
• No actual issues masked by noise reduction
• Changes documented in PR description

Estimated Effort

Medium (2-4 hours)
Related to #6857

AI generated by Plan Command for discussion #6855