fix(release): use v<semver> tag format for nightly releases

.github/workflows/release.yml

@@ -4,6 +4,7 @@ on:
   push:
     tags:
       - "v*.*.*"
+      - "!v*-nightly.*"
   schedule:
     - cron: "0 */3 * * *"
   workflow_dispatch:
@@ -41,7 +42,7 @@ jobs:
       - id: check
         name: Compare HEAD to last nightly tag
         run: |
-          last_nightly_tag=$(git tag --list 'nightly-v*' --sort=-creatordate | head -n 1)
+          last_nightly_tag=$(git tag --list 'v*-nightly.*' 'nightly-v*' --sort=-creatordate | head -n 1)
           if [[ -z "$last_nightly_tag" ]]; then
             echo "No previous nightly tag found. Proceeding with release."
             echo "has_changes=true" >> "$GITHUB_OUTPUT"

scripts/release-smoke.ts

@@ -220,7 +220,7 @@ try {
   );
   assertContains(
     nightlyReleaseMetadata,
-    "tag=nightly-v9.9.10-nightly.20260413.321",
+    "tag=v9.9.10-nightly.20260413.321",
     "Expected nightly metadata to contain the derived nightly tag.",
   );
   assertContains(

scripts/resolve-nightly-release.test.ts

@@ -24,7 +24,7 @@ it("derives nightly metadata including the short commit sha in the release name"
     {
       baseVersion: "9.9.10",
       version: "9.9.10-nightly.20260413.321",
-      tag: "nightly-v9.9.10-nightly.20260413.321",
+      tag: "v9.9.10-nightly.20260413.321",
       name: "T3 Code Nightly 9.9.10-nightly.20260413.321 (abcdef123456)",
       shortSha: "abcdef123456",
     },

scripts/resolve-nightly-release.ts

@@ -54,7 +54,7 @@ export const resolveNightlyReleaseMetadata = (
   return {
     baseVersion,
     version,
-    tag: `nightly-v${version}`,
+    tag: `v${version}`,
     name: `T3 Code Nightly ${version} (${shortSha})`,
     shortSha,
   };

scripts/resolve-previous-release-tag.ts

@@ -75,11 +75,17 @@ const parseStableTag = (tag: string): StableVersion | undefined => {
   const [, major, minor, patch, prerelease] = match;
   if (!major || !minor || !patch) return undefined;
 
+  const prereleaseIdentifiers = prerelease ? prerelease.split(".") : [];
+  // Nightly tags also start with `v` and carry a `nightly.*` prerelease
+  // identifier. They must not be considered stable candidates when resolving
+  // the previous stable tag.
+  if (prereleaseIdentifiers[0] === "nightly") return undefined;
+
   return {
     major: Number(major),
     minor: Number(minor),
     patch: Number(patch),
-    prerelease: prerelease ? prerelease.split(".") : [],
+    prerelease: prereleaseIdentifiers,
   };
 };
 
@@ -92,7 +98,9 @@ const compareNightlyVersions = (left: NightlyVersion, right: NightlyVersion): nu
 };
 
 const parseNightlyTag = (tag: string): NightlyVersion | undefined => {
-  const match = /^nightly-v(\d+)\.(\d+)\.(\d+)-nightly\.(\d{8})\.(\d+)$/.exec(tag);
+  // Accept both the current `v<semver>` format and the legacy `nightly-v<semver>`
+  // format so release note diffs keep working across the tag-format transition.
+  const match = /^(?:nightly-)?v(\d+)\.(\d+)\.(\d+)-nightly\.(\d{8})\.(\d+)$/.exec(tag);
   if (!match) return undefined;
 
   const [, major, minor, patch, date, runNumber] = match;