stats+log : am stats (agregats par agent, periodes 7d/30d/90d, barres ASCII) et am log (filtres agent/kind/date, limite) (issue #6)

src/help.rs

@@ -198,6 +198,46 @@ pub static HELP_SPECS: &[HelpSpec] = &[
             HelpExample { desc: "Show one session with its log excerpt.", code: "sessions --show 20260815_143926_a1b2c3" },
         ],
     },
+    HelpSpec {
+        name: "stats",
+        category: "Commands",
+        usage: "stats {flags} [agent]",
+        about: "Show usage statistics computed from the event journal.",
+        search_terms: &["usage", "metrics", "duration"],
+        flags: &[
+            HelpFlag { short: "", long: "--period", value: "PERIOD", desc: "Only events of the last period (7d, 30d, 90d, all)" },
+        ],
+        subcommands: &[],
+        parameters: &[
+            HelpParam { name: "agent", typ: "string", desc: "Agent name or alias (omit for the global view)" },
+        ],
+        io: None,
+        examples: &[
+            HelpExample { desc: "Global usage statistics.", code: "stats" },
+            HelpExample { desc: "One agent over the last month.", code: "stats claude-code --period 30d" },
+        ],
+    },
+    HelpSpec {
+        name: "log",
+        category: "Commands",
+        usage: "log {flags} [agent]",
+        about: "Read the event journal: everything am did.",
+        search_terms: &["journal", "events", "history"],
+        flags: &[
+            HelpFlag { short: "", long: "--kind", value: "KINDS", desc: "Only these event kinds (comma separated)" },
+            HelpFlag { short: "", long: "--since", value: "DATE", desc: "Only events at or after this date (YYYY-MM-DD or RFC 3339)" },
+            HelpFlag { short: "", long: "--limit", value: "N", desc: "Maximum number of events (default: 50)" },
+        ],
+        subcommands: &[],
+        parameters: &[
+            HelpParam { name: "agent", typ: "string", desc: "Only events of this agent" },
+        ],
+        io: None,
+        examples: &[
+            HelpExample { desc: "The last 50 events.", code: "log" },
+            HelpExample { desc: "Starts of one agent since a date.", code: "log claude-code --kind start --since 2026-08-01" },
+        ],
+    },
     HelpSpec {
         name: "search",
         category: "Commands",