feat(pr-sous-chef): exempt CONFLICTING PRs from last-comment-from-sous-chef skip

[Copilot]

When the last comment on a PR is from sous-chef, it skips the PR to avoid back-to-back nudges. This silently stalls PRs with merge conflicts — sous-chef posts the merge-main nudge once, then never repeats it even though the conflict remains unresolved.

Changes

• Bash prefilter (fetch-prs step): gates the continue on mergeStateStatus != CONFLICTING, so conflicting PRs always pass through to the eligible list regardless of the last comment author

  # Before
  if [ "$last_comment_is_sous_chef" = "true" ]; then
    filtered_last_comment_from_sous_chef=$((...))
    continue
  fi
  
  # After
  merge_state_status="$(jq -r '.mergeStateStatus // ""' <<<"$pr")"
  if [ "$last_comment_is_sous_chef" = "true" ] && [ "$merge_state_status" != "CONFLICTING" ]; then
    filtered_last_comment_from_sous_chef=$((...))
    continue
  fi

• Skip rule 2 (prompt): documents the CONFLICTING exception so the agent respects it during its own skip evaluation
• pr-processor sub-agent: mirrors the same exception in its skip-condition list

[Copilot]

Pull request overview

Updates the pr-sous-chef workflow so PRs that are merge-conflicting don’t get permanently skipped just because the most recent comment was previously posted by sous-chef—allowing repeated conflict-resolution nudges until the conflict is addressed.

Changes:

• Adjusts the fetch-prs bash prefilter to not skip when the last comment is from sous-chef if mergeStateStatus == CONFLICTING.
• Updates the in-workflow documentation/prompted skip rules (including the pr-processor sub-agent) to reflect the new CONFLICTING exception.
• Regenerates the compiled workflow lock for pr-sous-chef (and also updates metadata in design-decision-gate.lock.yml).

Show a summary per file

File	Description
.github/workflows/pr-sous-chef.md	Adds CONFLICTING exception in prefilter and documents the same rule for the agent/sub-agent skip logic.
.github/workflows/pr-sous-chef.lock.yml	Regenerated compiled workflow reflecting the updated prefilter logic.
.github/workflows/design-decision-gate.lock.yml	Metadata changed (body hash), seemingly unrelated to the pr-sous-chef change.

Review details

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• Files reviewed: 3/3 changed files
• Comments generated: 1
• Review effort level: Low