[probe] pr-reviewer substance battery

.github/workflows/pr-reviewer-substance-failing-check.yml

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+name: pr-reviewer substance failing check
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  forced-failure:
+    runs-on: ubuntu-latest
+    steps:
+      - name: fail for pr-reviewer substance test
+        run: |
+          echo "substance-test-2 forced CI failure"
+          exit 1

docs/pr-reviewer-substance-conflict-sync.md

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+This file exists only to trigger a pull_request.synchronize event while PR #60
+is intentionally merge-conflicting against its temporary probe base branch.

docs/pr-reviewer-substance-serialized-trigger.md

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+This external commit is the serialized follow-up trigger after the prior
+pr-reviewer run withheld changes because the branch moved mid-review.

src/main/pr-reviewer-substance-probe.ts

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+export interface ProbeProfile {
+  displayName?: string
+}
+
+export function formatProbeGreeting(profile: ProbeProfile | null): string {
+  const normalized = profile ?? {}
+  return `Hello, ${normalized.displayName!.trim()}`
+}