fix(ci): authenticate gh release lookup and fail loud on lookup error

Two issues caught in review on #2597:

1. `gh release list` in GitHub Actions requires GH_TOKEN. The release
   notes step in `.github/workflows/ci.yml` had no env block, so gh would
   exit non-zero and the script's silent fallback would re-strand the
   silent-tag entries this change is meant to recover. Pass
   `GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}` to the step.

2. Silently degrading to legacy single-version output on gh failure is
   itself the regression vector — a future token misconfig or gh outage
   would lose data with no signal. `resolvePublishedFloorTag` now throws
   on gh failure with an actionable hint ("pass GH_TOKEN in Actions; set
   OMP_RELEASE_NOTES_FLOOR= locally to opt into legacy mode"). The
   thrown error propagates out of `main` and exits non-zero, failing the
   CI step loudly so the release is rebuilt with the fix.

The legitimate null path is preserved: `OMP_RELEASE_NOTES_FLOOR=`
(empty) still forces single-version mode, and a successful gh call with
no candidate < target still returns null (first-ever publish case).

Verified locally: hiding gh from PATH now exits 1 with the hint;
`OMP_RELEASE_NOTES_FLOOR=` with hidden gh still produces the legacy
84-bullet single-version output.

Refs #2596

.github/workflows/ci.yml

@@ -649,6 +649,13 @@ jobs:
            with:
               bun-version: "1.3"
          - name: Generate release notes from CHANGELOGs
+           env:
+              # `gh release list` (used to find the latest published GitHub
+              # Release tag below the target so silent-tag changelog sections
+              # roll forward — #2596) requires GH_TOKEN in Actions. Without
+              # it gh exits non-zero and the script would degrade to legacy
+              # single-version notes, defeating the recovery.
+              GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
            run: bun scripts/ci-release-notes.ts ${{ needs.release_metadata.outputs.release-tag }}
          - name: Download release binaries
            uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1

scripts/ci-release-notes.ts

@@ -188,13 +188,18 @@ async function loadPackageName(pkgDir: string): Promise<string> {
 
 /**
  * Resolve the highest published, non-prerelease, non-draft semver tag strictly
- * below `targetVersion`. Falls back to `null` on error or no candidate, which
- * downgrades the script to legacy single-version extraction.
+ * below `targetVersion` via `gh release list`.
  *
- * `OMP_RELEASE_NOTES_FLOOR` env override:
- *   - unset → query `gh` (CI default)
- *   - `vX.Y.Z` → use as-is (manual rerun: "I know the floor")
- *   - empty string → force single-version mode (legacy escape hatch)
+ * Failure semantics:
+ *   - `OMP_RELEASE_NOTES_FLOOR` set → honored verbatim (`""` forces null).
+ *   - `gh` succeeded, no candidate < target → `null` (legitimate first-ever
+ *     publish; legacy single-version output is correct).
+ *   - `gh` itself failed (missing binary, missing `GH_TOKEN` in Actions,
+ *     network/auth error) → throws. Letting this degrade to single-version
+ *     output silently re-strands silent-tag entries (#2596 review); the CI
+ *     step must die loudly so the release is rebuilt with the token wired.
+ *     Local runs without `gh` should set `OMP_RELEASE_NOTES_FLOOR=` to opt
+ *     into legacy mode explicitly.
  */
 async function resolvePublishedFloorTag(targetVersion: string): Promise<string | null> {
 	const override = process.env.OMP_RELEASE_NOTES_FLOOR;
@@ -207,21 +212,22 @@ async function resolvePublishedFloorTag(targetVersion: string): Promise<string |
 			.quiet()
 			.nothrow();
 	if (res.exitCode !== 0) {
-		console.warn(
-			`Warning: gh release list failed (exit ${res.exitCode}); falling back to single-version notes. stderr: ${res.stderr.toString().trim()}`,
+		const stderr = res.stderr.toString().trim();
+		throw new Error(
+			`gh release list exited ${res.exitCode}.\nstderr: ${stderr || "(empty)"}\n` +
+				`Hint: in GitHub Actions, pass GH_TOKEN: \${{ secrets.GITHUB_TOKEN }} to this step. ` +
+				`Locally without gh, set OMP_RELEASE_NOTES_FLOOR= to fall back to single-version notes.`,
 		);
-		return null;
 	}
 	let raw: unknown;
 	try {
 		raw = JSON.parse(res.stdout.toString());
 	} catch (err) {
-		console.warn(
-			`Warning: failed to parse gh release list output: ${(err as Error).message}; falling back to single-version notes.`,
-		);
-		return null;
+		throw new Error(`gh release list returned non-JSON output: ${(err as Error).message}`);
+	}
+	if (!Array.isArray(raw)) {
+		throw new Error(`gh release list returned a non-array payload: ${typeof raw}`);
 	}
-	if (!Array.isArray(raw)) return null;
 	const candidates = (raw as Array<{ tagName?: unknown; isDraft?: unknown; isPrerelease?: unknown }>)
 		.filter(t => t.isDraft !== true && t.isPrerelease !== true)
 		.map(t => (typeof t.tagName === "string" ? t.tagName : ""))