feat(agents): darkwing host-dev launcher + entry-point consolidation

scripts/agent.sh --host-dev delegates to scripts/agent-host-dev.sh;
agents/darkwing/launch.sh provides the native development TUI
(context, skills, coding tools, /goal). Root SOUL.md is the M14-era
default-collaborator persona captured by the ACT-1 context work.
Launcher regression checks pass (test-darkwing-launch.mjs).

scripts/agent.sh

@@ -1,9 +1,11 @@
 #!/usr/bin/env bash
-# Launch an interactive (TUI) Mosaic agent in its container.
+# Launch an interactive Mosaic agent (container by default).
 #
 # Usage:
 #   scripts/agent.sh <name> [--mission <file>] [--workspace <ws>]
 #                    [--session <name>] [--tools <comma,list>] [--auth <account>]
+#   scripts/agent.sh --host-dev <name> [--fresh] [--check]
+#                    [--soul <file>] [--constitution <file>] [--user <file>]
 #
 # The agent receives the four immutable contracts (constitution, standards,
 # SOUL, USER) plus its own identity and optional mission directives as its
@@ -14,6 +16,12 @@
 # governed context.
 set -euo pipefail
 cd "$(dirname "$0")/.."
+# Host development is an explicit leading mode, never a fallback from a
+# container/config/policy refusal. Its helper owns its distinct native setup.
+if [ "${1:-}" = "--host-dev" ]; then
+    shift
+    exec "$PWD/scripts/agent-host-dev.sh" "$@"
+fi
 # shellcheck source=common.sh
 source scripts/common.sh
 
@@ -33,7 +41,7 @@ while [ $# -gt 0 ]; do
         --tools)     TOOLS="${2:?}"; shift 2 ;;
         --auth)      AUTH_ACCOUNT="${2:?}"; shift 2 ;;
         --skills)    SKILLS="${2:?}"; shift 2 ;;
-        --help|-h)   sed -n '2,12p' "$0"; exit 0 ;;
+        --help|-h)   sed -n '2,15p' "$0"; exit 0 ;;
         *)           NAME="$1"; shift ;;
     esac
 done