feat: phase 2 — am lab (benchmark N agents) + plugins d'événements (contrat JSON)

- #62: am lab --agents a,b --task <f> — séquentiel ou --parallel, capture
  durée/exit/sortie/coût estimé, rapport comparatif tableau + --json stable,
  tâches versionnables dans <state>/lab/ (--list), rejouables à l'identique
- #75: plugins/ sous state_dir, déclenchés sur on_install/on_start/on_stop/
  on_update (App::emit), contrat JSON stdin/stdout, timeout configurable,
  échec non bloquant, garde anti-récursion AM_PLUGINS_RUNNING, am plugins
  + am plugins --test <name> (CI), exemples notify + ci-webhook
- intégration REPL (parse, complétion, bannière, is_am_command), help, tips,
  man pages (am-lab.1, am-plugins.1), README, ROADMAP (26/27), v0.5.4
- 334 tests verts (309 + 25)

closes #62
closes #75

man/am-lab.1

@@ -0,0 +1,28 @@
+.ie \n(.g .ds Aq \(aq
+.el .ds Aq '
+.TH am-lab 1  "lab " 
+.SH NAME
+lab \- Benchmark: run the same task on several agents and compare (issue #62)
+.SH SYNOPSIS
+\fBlab\fR [\fB\-\-agents\fR] [\fB\-\-task\fR] [\fB\-\-parallel\fR] [\fB\-\-timeout\fR] [\fB\-\-list\fR] [\fB\-h\fR|\fB\-\-help\fR] 
+.SH DESCRIPTION
+Benchmark: run the same task on several agents and compare (issue #62)
+.SH OPTIONS
+.TP
+\fB\-\-agents\fR \fI<AGENTS>\fR
+Comma\-separated agent names (or aliases) to benchmark
+.TP
+\fB\-\-task\fR \fI<FILE>\fR
+Task file (a bare name resolves under state_dir/lab/, .yaml appended)
+.TP
+\fB\-\-parallel\fR
+Run every agent concurrently instead of one after another
+.TP
+\fB\-\-timeout\fR \fI<SECS>\fR
+Override the task timeout in seconds
+.TP
+\fB\-\-list\fR
+List the task files of the lab directory
+.TP
+\fB\-h\fR, \fB\-\-help\fR
+Print help

man/am-plugins.1

@@ -0,0 +1,16 @@
+.ie \n(.g .ds Aq \(aq
+.el .ds Aq '
+.TH am-plugins 1  "plugins " 
+.SH NAME
+plugins \- List the event plugins and test one (issue #75)
+.SH SYNOPSIS
+\fBplugins\fR [\fB\-\-test\fR] [\fB\-h\fR|\fB\-\-help\fR] 
+.SH DESCRIPTION
+List the event plugins and test one (issue #75)
+.SH OPTIONS
+.TP
+\fB\-\-test\fR \fI<NAME>\fR
+Run one plugin against a synthetic event and print its response
+.TP
+\fB\-h\fR, \fB\-\-help\fR
+Print help

man/am.1

@@ -1,6 +1,6 @@
 .ie \n(.g .ds Aq \(aq
 .el .ds Aq '
-.TH am 1  "am 0.5.3" 
+.TH am 1  "am 0.5.4" 
 .SH NAME
 am \- agent\-manager (am) — manage local AI coding agents
 .SH SYNOPSIS
@@ -171,6 +171,12 @@ Search the command history (am and shell commands)
 am\-playbook(1)
 Replay a saved playbook step by step with confirmation (issue #51)
 .TP
+am\-lab(1)
+Benchmark: run the same task on several agents and compare (issue #62)
+.TP
+am\-plugins(1)
+List the event plugins and test one (issue #75)
+.TP
 am\-info(1)
 Show detailed information about one agent
 .TP
@@ -210,4 +216,4 @@ Export the configuration and installation state (backup)
 am\-import(1)
 Import a previously exported configuration and state
 .SH VERSION
-v0.5.3
+v0.5.4