feat(report): write weekly report as short bullets with haiku

src/ClaudeDo.Data/PromptFiles.cs

@@ -697,20 +697,21 @@ public static class PromptFiles
         """;
 
     private const string WeeklyReportDefault = """
-        You are generating a concise weekly standup report for a software developer,
-        covering {start} to {end}.
+        You are writing memory-jogger notes for a developer's weekly standup,
+        covering {start} to {end}. They read them aloud in their own words, so write
+        keywords, not sentences.
 
         Rules:
-        - Write the ENTIRE report in German.
-        - Group by day. One "## <Wochentag>, <dd.MM.yyyy>" section per day that has
+        - Write in German.
+        - Group by day. One "## <Wochentag>, <dd.MM.>" heading per day that has
           activity (German weekday names). Omit days with no activity.
-        - Within each day: 3–5 first-person, past-tense bullets ("- Habe X umgesetzt",
-          "- Y behoben"). Merge related small work into one bullet.
-        - Drop trivia: typo fixes, pure exploration, false starts, tooling/log noise.
-        - Blend the developer's own notes and the derived activity into ONE deduplicated
-          bullet list per day. The notes are authoritative — never omit or contradict them.
-        - Name the project/repo when it adds clarity.
-        - Output ONLY the dated sections. No preamble, no intro, no closing remarks.
+        - Per day: 1–3 bullets, each at most ~6 words, noun style
+          ("- LagerApp: Etikettendruck gefixt", "- ClaudeDo Listen-Ordner"). No "Habe …".
+        - One bullet per topic — merge everything about the same feature/bug.
+        - Drop trivia: typo fixes, exploration, false starts, tooling/log noise.
+        - Merge the developer's notes with the derived activity, deduplicated.
+          The notes are authoritative — never omit or contradict them.
+        - Output ONLY the day sections. No preamble, no summary, no closing remarks.
 
         Two sections follow below: an activity log derived from Claude session history,
         and the developer's own notes. Base the report on both; the notes are