Release notes written from the commits since the previous tag

- The release page's "What's new" now comes from each commit's subject and body since the
  previous tag, without trailers or any line naming the assistant that helped write them.
- `tools/release.sh notes` writes the notes alone; the release checkout fetches the tags.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012CzABvBkbcFqoHdmi8b9WB

tools/release.cs

@@ -22,9 +22,9 @@ if (version is null || !Regex.IsMatch(version, @"^\d+\.\d{1,2}\.\d{1,2}$"))
 }
 var words = args.Where((a, i) => !a.StartsWith("--", StringComparison.Ordinal) && (i == 0 || !args[i - 1].StartsWith("--", StringComparison.Ordinal)))
   .Select(a => a.ToLowerInvariant()).ToList();
-if (words.Count == 0 || words.Any(w => w != "all" && !targetNames.Contains(w)))
+if (words.Count == 0 || words.Any(w => w != "all" && w != "notes" && !targetNames.Contains(w)))
 {
-  Console.Error.WriteLine("usage: tools/release.sh <all|linux|windows|macos|android|server>... [--commit <sha>]");
+  Console.Error.WriteLine("usage: tools/release.sh <all|linux|windows|macos|android|server|notes>... [--commit <sha>]");
   return 2;
 }
 var targets = words.Contains("all") ? targetNames.ToList() : targetNames.Where(words.Contains).ToList();
@@ -37,6 +37,12 @@ var server = Path.Combine(root, "src", "MeWeb.Server", "MeWeb.Server.csproj");
 var branding = Path.Combine(root, "branding");
 Directory.CreateDirectory(output);
 Console.WriteLine($"me-web? {version} ({commit}): {string.Join(", ", targets)} -> {output}");
+if (targets.Count == 0)
+{
+  WriteNotes();
+  Console.WriteLine(File.ReadAllText(Path.Combine(root, "artifacts", "release-notes.md")));
+  return 0;
+}
 
 var failed = false;
 if (targets.Any(t => t != "server"))
@@ -72,19 +78,40 @@ return failed ? 1 : 0;
 void WriteNotes()
 {
   var source = Path.Combine(root, "artifacts", "knowledge", "SOURCE.txt");
-  var lines = new List<string>
-  {
+  var lines = Changes();
+  lines.AddRange(
+  [
     $"me-web? {version}, commit {commit}, built {builtAt}.",
     "",
     "Built with the provider map from iptoasn.com (PDDL 1.0):",
     "",
-  };
+  ]);
   lines.AddRange(File.Exists(source) ? File.ReadAllLines(source).Where(l => l.Length > 0).Select(l => $"    {l}") : ["    (no provider map in this build)"]);
   lines.AddRange(["", "SHA256SUMS.txt lists every file. The APK's signing certificate SHA-256 is 5f52cff4f52f4e0b6da6cd044bfceaf78d1d42db24f2470602db7f19cbfdf846."]);
   Directory.CreateDirectory(Path.Combine(root, "artifacts"));
   File.WriteAllLines(Path.Combine(root, "artifacts", "release-notes.md"), lines);
 }
 
+List<string> Changes()
+{
+  var previous = Capture("git", "-C", root, "describe", "--tags", "--abbrev=0", "--match", "v*", "HEAD^").Trim();
+  var log = Capture("git", "-C", root, "log", "--no-merges", "--reverse", "--format=%x1e%s%x1f%b", previous.Length > 0 ? $"{previous}..HEAD" : "HEAD");
+  var lines = new List<string>();
+  foreach (var entry in log.Split('\x1e', StringSplitOptions.RemoveEmptyEntries))
+  {
+    var parts = entry.Split('\x1f');
+    var subject = Regex.Replace(parts[0].Trim(), @"^me-web\? [\d.]+:\s*", "");
+    if (subject.Length == 0) continue;
+    var body = (parts.Length > 1 ? parts[1] : "").Split('\n').Select(l => l.TrimEnd())
+      .Where(l => !Regex.IsMatch(l, @"^[A-Za-z-]+-(By|Session|Off-By):", RegexOptions.IgnoreCase))
+      .Where(l => !l.Contains("claude", StringComparison.OrdinalIgnoreCase))
+      .SkipWhile(l => l.Length == 0).Reverse().SkipWhile(l => l.Length == 0).Reverse().ToList();
+    lines.AddRange([$"### {char.ToUpperInvariant(subject[0])}{subject[1..]}", ""]);
+    if (body.Count > 0) lines.AddRange([.. body, ""]);
+  }
+  return lines.Count == 0 ? [] : [$"## What's new in {version}", "", .. lines];
+}
+
 string[] Stamp() => [$"-p:Version={version}", $"-p:BuildCommit={commit}", $"-p:BuildTimeUtc={builtAt}"];
 
 string Linux()