fix(cli): wire context_set to spec-aligned rendering helpers

The PR added build_context_set_payload / render_context_set_plain /
render_context_set_rich in cleveragents.cli.rendering.project_context_set
but context_set never called them: rich output rendered a single
"Context Policy Updated" panel and json/yaml/plain went through
format_output(data, output_format) with no envelope kwargs. The five
BDD scenarios validating the spec envelope therefore failed.

Replace the tail of context_set so rich emits the four spec panels
(Context Policy / Limits / Summarization / Other Views) plus the
"checkmark Context policy updated" line, plain calls
render_context_set_plain directly, and json/yaml flow through
format_output with command="project context set", status="ok",
exit_code=0, and messages=[{level: ok, text: "Context policy updated"}].

ISSUES CLOSED: #6319

src/cleveragents/cli/commands/project_context.py

@@ -779,20 +779,45 @@ def context_set(
             },
         )
 
-    data = _policy_to_dict(policy)
-    data["acms_config"] = acms
-    if output_format.lower() == OutputFormat.RICH:
-        console.print(
-            Panel(
-                f"[green]✓[/green] Context policy "
-                f"'{view}' view updated for "
-                f"project '{project}'.",
-                title="Context Policy Updated",
-                expand=False,
-            )
-        )
+    from cleveragents.cli.rendering.project_context_set import (
+        build_context_set_payload,
+        render_context_set_plain,
+        render_context_set_rich,
+    )
+
+    payload = build_context_set_payload(
+        project=project,
+        view=view,
+        policy=policy,
+        acms=acms,
+        default_limits={
+            "hot_max_tokens": _DEFAULT_HOT_MAX_TOKENS,
+            "warm_max_decisions": _DEFAULT_WARM_MAX_DECISIONS,
+            "cold_max_decisions": _DEFAULT_COLD_MAX_DECISIONS,
+            "query_limit": None,
+        },
+    )
+
+    success_message = "Context policy updated"
+    fmt_lower = output_format.lower()
+
+    if fmt_lower == OutputFormat.RICH.value:
+        for panel in render_context_set_rich(payload):
+            console.print(panel)
+        console.print(f"[green]\u2713[/green] {success_message}")
+    elif fmt_lower == OutputFormat.PLAIN.value:
+        console.print(render_context_set_plain(payload, success_message))
     else:
-        console.print(format_output(data, output_format))
+        rendered = format_output(
+            payload,
+            output_format,
+            command="project context set",
+            status="ok",
+            exit_code=0,
+            messages=[{"level": "ok", "text": success_message}],
+        )
+        if rendered:
+            console.print(rendered)
 
 
 @app.command(name="show")