Make failure investigator log capture fault-aware

[Copilot]

Failure Investigator was treating backend cleanup markers as real failures, masking pre-network Copilot CLI startup errors and reporting false-negative captures.

• Fault detection
  • Replace broad ##[error]/generic matching with fault and non-zero-exit markers.
  • Search backward through full job logs for the most recent meaningful fault.
• Capture validation
  • Validate markers within the captured window itself.
  • Set capture_likely_missed_fault when the window lacks fault evidence.
• Workflow parity
  • Regenerate the compiled workflow lock file.
  • Add regression assertions for the updated heuristic.

has_fault_marker=any(
FAULT_MARKER.search(line) forlineincaptured_lines
)
capture_likely_missed_fault=nothas_fault_marker

• Fixes[aw-failures] [P0] Log-capture blindness regressed — GH Copilot CLI failures (Ponytail Reviewer, Daily Max Ai Credits Test) invi [Content truncated due to length] #54009

[Copilot]

Pull request overview

Updates failure-investigator log capture to locate meaningful faults and validate captured windows.

Changes:

• Introduces fault-marker-based backward log searching.
• Updates capture validation and regression assertions.
• Regenerates the compiled workflow.

Show a summary per file

File	Description
.github/workflows/aw-failure-investigator.md	Updates fault detection and capture validation.
.github/workflows/aw-failure-investigator.lock.yml	Regenerates the compiled workflow.
pkg/cli/aw_failure_investigator_workflow_test.go	Updates heuristic assertions.

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• Files reviewed: 3/3 changed files
• Comments generated: 2
• Review effort level: Balanced