feat(agent): add persistent runtime context providers

tests/agent/test_session_manager_history.py

@@ -1,3 +1,8 @@
+from nanobot.runtime_context import (
+    RUNTIME_CONTEXT_HISTORY_META,
+    RuntimeContextBlock,
+    append_runtime_context,
+)
 from nanobot.session.manager import Session, SessionManager
 
 
@@ -425,6 +430,41 @@ def test_get_history_synthesizes_cli_app_attachment_breadcrumb():
     }]
 
 
+def test_get_history_does_not_duplicate_persisted_capability_runtime_context():
+    content, marker = append_runtime_context(
+        "please use @drawio",
+        [RuntimeContextBlock(
+            source="cli_apps",
+            content="[Runtime Context]\nCLI App Attachment: @drawio",
+        ), RuntimeContextBlock(
+            source="mcp",
+            content="[Runtime Context]\nMCP Preset Attachment: @linear",
+        )],
+    )
+    session = Session(key="test:cli-app-persisted")
+    session.messages.append({
+        "role": "user",
+        "content": content,
+        "cli_apps": [{
+            "name": "drawio",
+            "entry_point": "cli-anything-drawio",
+        }],
+        "mcp_presets": [{"name": "linear", "transport": "stdio"}],
+        RUNTIME_CONTEXT_HISTORY_META: marker,
+    })
+
+    model_history = session.get_history(max_messages=500)
+    public_history = session.get_history(
+        max_messages=500,
+        include_runtime_context=False,
+    )
+
+    assert model_history == [{"role": "user", "content": content}]
+    assert model_history[0]["content"].count("CLI App Attachment: @drawio") == 1
+    assert model_history[0]["content"].count("MCP Preset Attachment: @linear") == 1
+    assert public_history == [{"role": "user", "content": "please use @drawio"}]
+
+
 def test_fork_session_before_user_index_copies_only_prefix(tmp_path):
     manager = SessionManager(tmp_path)
     source = manager.get_or_create("websocket:source")