fix(store): source_issue "none" clears it (move a split's closing edge)

__init__.py

@@ -736,7 +736,8 @@ def board_update_feature(
         this tool never removes the flag). `source_issue` (a full GitHub issue URL or
         `owner/repo#N`, stored normalized off-label in the bead's notes metadata)
         sets/replaces the originating issue the feature's PR will reference as
-        `Fixes #N`. `project` RE-HOMES the card to another entry of the board's
+        `Fixes #N`; `"none"` clears it (move a split's closing edge to its last slice).
+        `project` RE-HOMES the card to another entry of the board's
         `projects:` map (#454) — e.g. the cards left on `default` after a board moved from
         the flat `repo:` binding to projects. A card's project decides which repo its
         worktree/branch/PR target, so the move is allowed only while the card is backlog

api.py

@@ -697,7 +697,7 @@ async def _progress(fid: str):
     async def _patch_feature(fid: str, body: dict = Body(default={})):
         """In-place spec edit — the REST complement of ``board_update_feature``.
         Accepts ``title``, ``spec``, ``acceptance_criteria``, ``design``,
-        ``files_to_modify``, ``difficulty``, ``source_issue``, ``waits_for`` (replaces the
+        ``files_to_modify``, ``difficulty``, ``source_issue`` (``"none"`` clears it), ``waits_for`` (replaces the
         publish gates; ``[]`` clears), ``project`` (re-homes the card, #454 — backlog/ready,
         no PR, never dispatched; refused with the reason otherwise); only non-null
         fields are written. Refuses edits to an ``in_progress`` feature unless

store.py

@@ -2222,7 +2222,11 @@ def update_feature(
             args += [f"--design={design}"]
         if priority is not None:
             args += ["-p", str(validate_priority(priority))]
-        set_source = source_issue is not None and str(source_issue).strip()
+        # "none" / "clear" / "-" CLEARS the source issue (the `waits_for` convention): a
+        # split whose closing edge moves to a later slice must be able to drop it here, or
+        # two slices would both say "Fixes #N" and the first merge closes the issue early.
+        clear_source = isinstance(source_issue, str) and source_issue.strip().lower() in ("none", "clear", "-")
+        set_source = (source_issue is not None and str(source_issue).strip()) or clear_source
         if files_to_modify is not None or set_source or new_waits is not None:
             # files_to_modify + source_issue + the requirement ledger SHARE the bead
             # `notes` field (labels can't carry the source's `/`/`#`, #101; the
@@ -2238,7 +2242,10 @@ def update_feature(
                 if files_to_modify is not None
                 else f.get("files_to_modify") or []
             )
-            src = normalize_source_issue(source_issue) if set_source else str(f.get("source_issue") or "")
+            if clear_source:
+                src = ""
+            else:
+                src = normalize_source_issue(source_issue) if set_source else str(f.get("source_issue") or "")
             waits = new_waits if new_waits is not None else list(f.get("waits_for") or [])
             args += [f"--notes={_render_notes(files, src, f.get('requirements') or [], waits)}"]
         if difficulty is not None:

tests/test_store.py

@@ -3179,6 +3179,23 @@ def test_update_feature_replaces_a_stale_source_line_and_keeps_files(make_board,
     assert call == ("update", "bd-1", "--notes=a.py\nsource-issue: acme/widgets#9")
 
 
+@pytest.mark.parametrize("sentinel", ["none", "CLEAR", " - "])
+def test_update_feature_none_clears_the_source_line_and_keeps_files(make_board, monkeypatch, sentinel):
+    """A split whose closing edge moves to a later slice drops the earlier slice's source
+    issue; otherwise two slices both say "Fixes #N" and the first merge closes it early."""
+    br = Br()
+    b = make_board(br)
+    monkeypatch.setattr(
+        b,
+        "_require",
+        lambda fid: {"id": fid, "files_to_modify": ["a.py"], "source_issue": "acme/widgets#9", "labels": []},
+    )
+    monkeypatch.setattr(b, "get_feature", lambda fid: {"id": fid, "labels": []})
+    b.update_feature("bd-1", source_issue=sentinel)
+    (call,) = br.cmds("update")
+    assert call == ("update", "bd-1", "--notes=a.py")
+
+
 def test_update_feature_files_update_preserves_the_source_line(make_board, monkeypatch):
     """The mirror image: a files-only update must never drop the stored source."""
     br = Br()