feat: import agents_and_robots platform as unibots (Matrix-out, unibus transport)

Reemplaza el scaffold del echobot por la plataforma completa de bots traida
desde ~/DataProyects/Github/agents_and_robots tras la operacion Matrix-out:
los bots ya no hablan por Matrix sino por el bus unibus (modelo todo-rooms +
E2E via shell/transportunibus sobre github.com/enmanuel/unibus/pkg/client).

- go.mod: replace de unibus -> ../unibus y de fn-registry -> ../../../.. (paths
  relativos reajustados a la nueva ubicacion dentro de fn_registry).
- app.md: bump a 0.2.0, descripcion + arquitectura + comandos + gotchas reales.
- modulo Go conservado como github.com/enmanuel/agents (sin reescribir imports).

agents_and_robots queda archivado como museo de la era Matrix.

pkg/tui/messages.go

@@ -0,0 +1,49 @@
+package tui
+
+// Messages are pure data returned by the shell adapter.
+// They carry the result of an I/O operation back into the pure Update.
+
+// MsgAgentsLoaded carries refreshed agent data + launcher status.
+type MsgAgentsLoaded struct {
+	Agents          []AgentView
+	LauncherRunning bool
+	LauncherPID     int
+	LauncherUptime  string
+	LauncherMemory  string
+	LauncherCPU     string
+	LauncherLogSize string
+}
+
+// MsgActionDone reports the result of an action (start/stop/enable/disable).
+type MsgActionDone struct {
+	AgentID string
+	Action  string
+	Err     error
+}
+
+// MsgLogsLoaded carries log lines for display.
+type MsgLogsLoaded struct{ Lines []string }
+
+// MsgServerActionDone reports the result of a launcher action.
+type MsgServerActionDone struct {
+	Action string
+	Err    error
+}
+
+// MsgRebuildDone reports the result of a rebuild & restart cycle.
+type MsgRebuildDone struct {
+	BuildOK  bool
+	BuildLog string // last lines of build output
+	Started  bool   // launcher started after build
+	Err      error
+}
+
+// MsgTestsDone reports the result of running tests.
+type MsgTestsDone struct {
+	Kind   TestKind // which test suite was executed
+	Passed bool
+	Output []string // lines of test output
+}
+
+// MsgTick triggers a periodic refresh.
+type MsgTick struct{}