feat(row6): a proposal whose approach declared no requirement is unsupported

Stress round 6 validated three falsification arms, and every validated
approach rested only on run-level declarations nobody can attribute to one
approach. declare_requirement now takes a required approach_id (a mandate
id or own-proposal; an unknown id is refused naming the valid ones), and a
ValidatedProposal whose approach has neither a mandate requirement nor a
declaration under its own id becomes validator.Unsupported - a Rejection
subclass carrying the validator's own ruling, reported as `unsupported` in
coverage, the outcome artefact, the settlement and the judge, and never
counted or summed. The rule is active whenever the debate held the
declaration tool, the micro base included; the road and pre-pass paths are
untouched. Declaration quality is not judged, so the rule can be satisfied
by declaring any document the run read.

The v1 gate's row 6 probes pass; its artefact half reads IKKE MÅLT because
stress round 6 predates approach-addressed declarations, and IKKE MÅLT is
never green - it fails the exit code.

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

tests/test_right_requirement_loadbearing.py

@@ -78,7 +78,9 @@ def _declare(
     for other in also:
         opened.append(ToolCall(name="read_file", bundle_id=base, path=other))
     opened.append(ToolCall(name="read_file", bundle_id=base, path=path))
-    return tools["declare_requirement"].func(bundle_id=base, path=path, ref="Krav 4.1.2-1")
+    return tools["declare_requirement"].func(
+        approach_id="a1", bundle_id=base, path=path, ref="Krav 4.1.2-1"
+    )
 
 
 def _base_with_a_requirement(root: Path) -> Path:
@@ -114,7 +116,11 @@ def test_the_reply_carries_the_documents_own_title_and_number(tmp_path: Path) ->
     assert answer["title"] == "Krav 4.1.2-1 Rundkjoring"
     assert answer["req_number"] == "Krav 4.1.2-1"
     assert "is the requirement the proposal rests on" in answer["binds"]
-    assert declared == [DeclaredRequirement(bundle_id="n-mini", path="krav.md", ref="Krav 4.1.2-1")]
+    assert declared == [
+        DeclaredRequirement(
+            bundle_id="n-mini", path="krav.md", ref="Krav 4.1.2-1", approach_id="a1"
+        )
+    ]
 
 
 def test_a_path_that_is_no_concept_answers_with_empty_strings(tmp_path: Path) -> None: