Add fluksio status, and ask for a run's parameters at a terminal

Two halves of the same gap: the CLI could start work but not show you any.

`fluksio status` draws the home screen's top half in a terminal — health and
what is wrong with it, every flow with its state and node count, and the
recent runs and failures under them. `--watch` keeps it there. Rich does the
drawing; it was already installed under fastapi's own CLI, and is named now
because a command depends on it.

`fluksio run` with no parameters at a terminal asks for them, one line per
declared input with its declared value in brackets — so Enter through the lot
is what running the defaults looks like, and an artifact input takes the
`@run:` spelling the engine now resolves. A scripted run is untouched: passing
any parameter, or piping the command, skips the questions, as does --defaults.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019V5bsYGNxcgPs4xXmTPx69

backend/fluksio/sdk/client.py

@@ -194,6 +194,25 @@ class Client:
         """Retire the engine's workers, so the next run imports the code as it is."""
         self._call("POST", "/modules/refresh")
 
+    def flows(self) -> list[dict[str, Any]]:
+        """Every flow with its node and error counts, as the home screen lists."""
+        result = self._call("GET", "/flows/")
+        return list(result.get("data") or [])
+
+    # -- how the engine is doing -------------------------------------------
+
+    def summary(self) -> dict[str, Any]:
+        """Health as the dashboard reads it: flows, nodes, queue, loop lag."""
+        result: dict[str, Any] = self._call("GET", "/observability/summary")
+        return result
+
+    def events(self, kind: str = "failure", limit: int = 10) -> list[dict[str, Any]]:
+        """What went wrong, or who changed what. Newest first."""
+        result = self._call(
+            "GET", "/observability/events", params={"kind": kind, "limit": limit}
+        )
+        return list(result or [])
+
     # -- runs --------------------------------------------------------------
 
     def submit(