test(display): encode provenance contract in tilde assertions

Two tests still encoded the pre-PR behaviour that the PR removes:

- tests/test_tui_gateway_server.py: the mirrored fixture carries no
  `context_estimated` flag, so under the PR's rule it is provider-reported
  usage and must render without `~`. The old expectation asserted the
  unconditional tilde main used to emit. Assert the flag-less case is
  unmarked and, in the same test, flip `context_estimated` both ways to
  pin that only the estimate carries `~` in the count and the percent.

- ui-tui appChromeStatusRule.test.tsx: `text.includes('~')` matched the
  `~/repo` cwd label, so the "not estimated" arm was always true. Extract
  the rendered context token and assert the tilde on that token only.

tests/test_tui_gateway_server.py

@@ -10868,7 +10868,7 @@ def test_slash_exec_r7_read_commands_use_metadata_mirror_flag_on(monkeypatch):
         "history": "live question from state db",
         "prompt": "host system prompt",
         "status": "Tokens: 140",
-        "context": "Context usage: ~80 / 1,000 tokens",
+        "context": "Context usage: 80 / 1,000 tokens",
         "tools": "terminal",
         "help": "/status",
     }
@@ -10886,6 +10886,16 @@ def test_slash_exec_r7_read_commands_use_metadata_mirror_flag_on(monkeypatch):
             assert expected in resp["result"]["output"]
             assert "stale parent mirror" not in resp["result"]["output"]
             assert "(._.)" not in resp["result"]["output"]
+        mirrored_usage = server._sessions["sid"]["_metadata_mirror"]["usage"]
+        for estimated in (True, False):
+            mirrored_usage["context_estimated"] = estimated
+            mirrored_usage["context_source"] = "local_estimate" if estimated else "provider_usage"
+            response = server.handle_request({
+                "id": "context-provenance", "method": "slash.exec",
+                "params": {"command": "context", "session_id": "sid"},
+            })
+            mark = "~" if estimated else ""
+            assert f"Context usage: {mark}80 / 1,000 tokens ({mark}8.0%)" in response["result"]["output"]
     finally:
         server._sessions.pop("sid", None)
 

ui-tui/src/__tests__/appChromeStatusRule.test.tsx

@@ -114,7 +114,10 @@ describe('StatusRule session title', () => {
           usage: { ...baseProps.usage, context_estimated: estimated }
         }))
 
-        expect(text.includes('~')).toBe(estimated)
+        const context = text.match(/(~?\d+(?:\.\d+)?k(?:\/\d+k| tok))/)?.[1]
+
+        expect(context, `context must render at ${cols} columns`).toBeTruthy()
+        expect(context?.startsWith('~')).toBe(estimated)
       }
     }
   })