history : historique structure par session + am history (issue #7) - migration one-shot de history.txt, filtres kind/cwd/search/failed/session, enregistrement REPL avec duree et exit

src/help.rs

@@ -238,6 +238,28 @@ pub static HELP_SPECS: &[HelpSpec] = &[
             HelpExample { desc: "Starts of one agent since a date.", code: "log claude-code --kind start --since 2026-08-01" },
         ],
     },
+    HelpSpec {
+        name: "history",
+        category: "Commands",
+        usage: "history {flags}",
+        about: "Search the command history (am and shell commands).",
+        search_terms: &["past", "commands", "rerun"],
+        flags: &[
+            HelpFlag { short: "", long: "--kind", value: "KIND", desc: "Only commands of this kind (am or shell)" },
+            HelpFlag { short: "", long: "--cwd", value: "DIR", desc: "Only commands run in this directory" },
+            HelpFlag { short: "", long: "--search", value: "TEXT", desc: "Full-text search in the command line" },
+            HelpFlag { short: "", long: "--failed", value: "", desc: "Only failed commands" },
+            HelpFlag { short: "", long: "--session", value: "ID", desc: "Only commands of this session" },
+        ],
+        subcommands: &[],
+        parameters: &[],
+        io: None,
+        examples: &[
+            HelpExample { desc: "The last 100 commands.", code: "history" },
+            HelpExample { desc: "Find past installs.", code: "history --search install" },
+            HelpExample { desc: "Failed commands only.", code: "history --failed" },
+        ],
+    },
     HelpSpec {
         name: "search",
         category: "Commands",