feat(irc): add interactive setup

feat(gateway): refine Platform._missing_ and platform-connected dispatch

Restricts plugin-name acceptance to bundled plugin scan + registry
(no arbitrary string -> enum-pollution), pulls per-platform connectivity
checks into a _PLATFORM_CONNECTED_CHECKERS lambda map with a clean
_is_platform_connected method, and adds tests covering the checker map,
plugin platform interface, and IRC setup wizard.

tests/tools/test_dockerfile_pid1_reaping.py

@@ -57,6 +57,32 @@ def _run_steps(dockerfile_text: str) -> list[str]:
     ]
 
 
+def _dockerfile_instructions(dockerfile_text: str) -> list[str]:
+    instructions: list[str] = []
+    current = ""
+
+    for raw_line in dockerfile_text.splitlines():
+        line = raw_line.strip()
+        if not line or line.startswith("#"):
+            continue
+
+        continued = line.removesuffix("\\").strip()
+        current = f"{current} {continued}".strip()
+        if not line.endswith("\\"):
+            instructions.append(current)
+            current = ""
+
+    return instructions
+
+
+def _run_steps(dockerfile_text: str) -> list[str]:
+    return [
+        instruction
+        for instruction in _dockerfile_instructions(dockerfile_text)
+        if instruction.startswith("RUN ")
+    ]
+
+
 def test_dockerfile_installs_an_init_for_zombie_reaping(dockerfile_text):
     """Some init (tini, dumb-init, catatonit) must be installed.
 
@@ -105,6 +131,26 @@ def test_dockerfile_entrypoint_routes_through_the_init(dockerfile_text):
     )
 
 
+def test_dockerfile_installs_tui_dependencies(dockerfile_text):
+    assert "ui-tui/package.json" in dockerfile_text
+    assert "ui-tui/packages/hermes-ink/package-lock.json" in dockerfile_text
+    assert any(
+        "ui-tui" in step
+        and "npm" in step
+        and (" install" in step or " ci" in step)
+        for step in _run_steps(dockerfile_text)
+    )
+
+
+def test_dockerfile_builds_tui_assets(dockerfile_text):
+    assert any(
+        "ui-tui" in step
+        and "npm" in step
+        and "run build" in step
+        for step in _run_steps(dockerfile_text)
+    )
+
+
 def test_dockerfile_installs_tui_dependencies(dockerfile_text):
     assert "ui-tui/package.json" in dockerfile_text
     assert "ui-tui/packages/hermes-ink/package-lock.json" in dockerfile_text