timeline : vue chronologique unifiee journal + historique REPL (issue #31) - filtres agent/projet/date, limite, parse_since partage

src/help.rs

@@ -234,6 +234,27 @@ pub static HELP_SPECS: &[HelpSpec] = &[
             HelpExample { desc: "One project in detail.", code: "projects api" },
         ],
     },
+    HelpSpec {
+        name: "timeline",
+        category: "Commands",
+        usage: "timeline {flags}",
+        about: "One chronological view of every activity (journal + REPL history).",
+        search_terms: &["chronology", "activity", "merged"],
+        flags: &[
+            HelpFlag { short: "", long: "--project", value: "PROJECT", desc: "Only activity of this project" },
+            HelpFlag { short: "", long: "--since", value: "DATE", desc: "Only activity at or after this date" },
+            HelpFlag { short: "", long: "--limit", value: "N", desc: "Maximum number of entries (default: 50)" },
+        ],
+        subcommands: &[],
+        parameters: &[
+            HelpParam { name: "agent", typ: "string", desc: "Only activity of this agent" },
+        ],
+        io: None,
+        examples: &[
+            HelpExample { desc: "The last 50 activities.", code: "timeline" },
+            HelpExample { desc: "One project since a date.", code: "timeline --project api --since 2026-08-01" },
+        ],
+    },
     HelpSpec {
         name: "log",
         category: "Commands",