Say when a run finished and when a failure happened

`fluksio status` listed recent runs and recent failures with no time on
them, so a red line said nothing about whether it was from a minute ago or
last week. Both carry an age now, spelled the way a duration is, and the
runs listing gained one too. The fields were already on the wire.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019Hra4ndWMCLU5F3KjUuVAc

backend/fluksio/sdk/cli.py

@@ -19,6 +19,7 @@ import sys
 import time
 from collections.abc import Callable, Iterable, Iterator
 from contextlib import contextmanager, nullcontext
+from datetime import UTC, datetime
 from pathlib import Path
 from typing import Any
 
@@ -804,7 +805,8 @@ def _status_screen(client: Client) -> Any:
                 )
                 + Text(
                     f"{str(row.get('flow', '')):<16}"
-                    f"{(row.get('duration_ms') or 0) / 1000:7.1f}s",
+                    f"{(row.get('duration_ms') or 0) / 1000:7.1f}s"
+                    f"  {_ago(row.get('finished_at') or row.get('created_at')):>9}",
                     style="dim",
                 )
             )
@@ -816,6 +818,7 @@ def _status_screen(client: Client) -> Any:
             )
             parts.append(
                 Text(f"  {where}  ", style="red")
+                + Text(f"{_ago(event.get('ts')):>9}  ", style="dim")
                 + Text(str(event.get("detail", ""))[:100], style="dim")
             )
     return Group(*parts)
@@ -857,9 +860,9 @@ def cmd_status(args: argparse.Namespace) -> int:
 #: value is read.
 PARAMS_WIDTH = 80
 
-#: What the columns before the inputs take: the id, status, flow, duration and
-#: stamp, with their spacing.
-LISTING_WIDTH = 84
+#: What the columns before the inputs take: the id, status, flow, duration,
+#: age and stamp, with their spacing.
+LISTING_WIDTH = 95
 
 
 def _declared(client: Client, flows: Iterable[str]) -> dict[str, dict[str, Any]]:
@@ -883,6 +886,28 @@ def _declared(client: Client, flows: Iterable[str]) -> dict[str, dict[str, Any]]
     return known
 
 
+def _ago(stamp: Any) -> str:
+    """How long ago something happened, in the notation the screens use.
+
+    A duration and an age read together, so they are spelled the same way:
+    seconds, then minutes, hours, days.
+    """
+    if not stamp:
+        return ""
+    try:
+        then = datetime.fromisoformat(str(stamp))
+    except ValueError:
+        return ""
+    if then.tzinfo is None:
+        # Everything the engine records is UTC; only some spellings say so.
+        then = then.replace(tzinfo=UTC)
+    seconds = max((datetime.now(UTC) - then).total_seconds(), 0)
+    for span, unit in ((86400, "d"), (3600, "h"), (60, "min")):
+        if seconds >= span:
+            return f"{seconds / span:.0f}{unit} ago"
+    return f"{seconds:.0f}s ago"
+
+
 def _stamp(row: dict[str, Any]) -> str:
     """What code a run ran: the commit, whether it was dirty, and the digest.
 
@@ -925,7 +950,8 @@ def cmd_runs(args: argparse.Namespace) -> int:
             params = params[: room - 3] + "..."
         _say(
             f"{row['id']}  {_status(row['status'], 9)} {row['flow']:<16} "
-            f"{row['duration_ms'] / 1000:7.1f}s  {_stamp(row):<22} {params}"
+            f"{row['duration_ms'] / 1000:7.1f}s {_ago(row.get('created_at')):>9}  "
+            f"{_stamp(row):<22} {params}"
         )
     return 0