fix(p16): the pre-call announcement must state the cap the run will use, not the constants

announce() read _DEFAULT_MAX_ROUNDS/_DEFAULT_MAX_TOKENS directly, which was correct only while
main() could not do otherwise. MEASURED on the first free drill after --max-rounds landed: the same
stdout said "Stops at: 3 rounds / 100000 tokens" two lines above "max_rounds=8, max_tokens=120000".
The announcement is the ONE thing printed before the first paid call and its whole job is to say
what the run will do -- the Fase-3 class, introduced by the very flag being announced.

Load-bearing MEASURED: arm (f) red before the fix; M16 (read the constants again) -> 1 red, that
arm ALONE. Green control 1670/5, golden BYTE-UNCHANGED (ea8c534...).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

tests/test_budget_flags_loadbearing.py

@@ -143,3 +143,43 @@ def test_e_the_documented_dry_run_command_form_is_accepted(tmp_path: Path) -> No
     )
     assert "unrecognized arguments" not in proc.stderr, proc.stderr
     assert proc.returncode == 0, proc.stderr
+
+
+def test_f_the_announcement_states_the_cap_the_run_will_actually_use(
+    tmp_path: Path, capsys: pytest.CaptureFixture[str]
+) -> None:
+    """``announce`` is the ONE thing printed BEFORE the first paid call, and its whole job is to
+    say what the run will do. It read ``_DEFAULT_MAX_ROUNDS``/``_DEFAULT_MAX_TOKENS`` directly,
+    which was correct only by accident while ``main()`` could not do otherwise. MEASURED on the
+    first free drill after the flags landed: the same stdout said ``Stops at: 3 rounds /
+    100000 tokens`` two lines above ``max_rounds=8, max_tokens=120000`` — the Fase-3 class (a
+    claim the surface makes about itself), introduced by the flag it announces."""
+    base = _base(tmp_path)
+    mandate = tmp_path / "m.json"
+    mandate.write_text(
+        '{"objective":"o","success_criteria":"s","approaches":'
+        '[{"id":"a1","label":"L","affected_codes":["C"],"claimed_saving_nok":1.0}]}',
+        encoding="utf-8",
+    )
+    rc = run_module.main(
+        [
+            "P1",
+            "--profile",
+            "local",
+            "--docs-dir",
+            str(base),
+            "--bundle-dir",
+            str(base),
+            "--mandate",
+            str(mandate),
+            "--max-rounds",
+            "8",
+            "--max-tokens",
+            "120000",
+            "--live-dry-run",
+        ]
+    )
+    assert rc == 0
+    out = capsys.readouterr().out
+    assert "Stops at:    8 rounds / 120000 tokens" in out, out
+    assert "3 rounds / 100000 tokens" not in out