feat(agent): add persistent runtime context providers

tests/agent/test_context_prompt_cache.py

@@ -9,6 +9,7 @@ from importlib.resources import files as pkg_files
 from pathlib import Path
 
 from nanobot.agent.context import ContextBuilder
+from nanobot.runtime_context import RuntimeContextBlock
 
 
 class _FakeDatetime(real_datetime):
@@ -61,8 +62,7 @@ def test_system_prompt_reflects_current_dream_memory_contract(tmp_path) -> None:
     assert "write important facts here" not in prompt
 
 
-def test_runtime_context_is_separate_untrusted_user_message(tmp_path) -> None:
-    """Runtime metadata should be merged with the user message."""
+def test_default_user_message_has_no_runtime_context(tmp_path) -> None:
     workspace = _make_workspace(tmp_path)
     builder = ContextBuilder(workspace)
 
@@ -76,19 +76,13 @@ def test_runtime_context_is_separate_untrusted_user_message(tmp_path) -> None:
     assert messages[0]["role"] == "system"
     assert "## Current Session" not in messages[0]["content"]
 
-    # Runtime context is now merged with user message into a single message
     assert messages[-1]["role"] == "user"
     user_content = messages[-1]["content"]
-    assert isinstance(user_content, str)
-    assert ContextBuilder._RUNTIME_CONTEXT_TAG in user_content
-    assert "Current Time:" in user_content
-    assert "Channel: cli" in user_content
-    assert "Chat ID: direct" in user_content
-    assert "Return exactly: OK" in user_content
+    assert user_content == "Return exactly: OK"
+    assert "_meta" not in messages[-1]
 
 
-def test_runtime_context_appended_after_user_content(tmp_path) -> None:
-    """User content must precede runtime context for prompt-cache prefix stability."""
+def test_provider_context_appended_after_user_content(tmp_path) -> None:
     workspace = _make_workspace(tmp_path)
     builder = ContextBuilder(workspace)
 
@@ -97,16 +91,18 @@ def test_runtime_context_appended_after_user_content(tmp_path) -> None:
         current_message="hello world",
         channel="cli",
         chat_id="direct",
+        runtime_context_blocks=[
+            RuntimeContextBlock(source="test", content="provider context"),
+        ],
     )
 
     content = messages[-1]["content"]
     user_pos = content.find("hello world")
-    tag_pos = content.find(ContextBuilder._RUNTIME_CONTEXT_TAG)
-    assert user_pos < tag_pos, "user content must precede runtime context for prefix stability"
+    context_pos = content.find("provider context")
+    assert user_pos < context_pos, "user content must precede provider context"
 
 
-def test_runtime_context_includes_sender_id_when_provided(tmp_path) -> None:
-    """Sender ID should be included in runtime context when provided."""
+def test_sender_id_is_not_injected_without_provider(tmp_path) -> None:
     workspace = _make_workspace(tmp_path)
     builder = ContextBuilder(workspace)
 
@@ -120,7 +116,8 @@ def test_runtime_context_includes_sender_id_when_provided(tmp_path) -> None:
 
     user_content = messages[-1]["content"]
     assert isinstance(user_content, str)
-    assert "Sender ID: user-12345" in user_content
+    assert user_content == "Return exactly: OK"
+    assert "Sender ID:" not in user_content
 
 
 def test_runtime_context_excludes_sender_id_when_not_provided(tmp_path) -> None: