Let the server decide whose memory a caller may read

A holder is now somebody who can prove it. Schema v11 stores a sha256 of a
per-holder token beside the directory row, so a copied database cannot replay
it and the plaintext is shown exactly once. The operator token mints and
revokes those tokens; a holder token reads that holder's own memories and
nothing else; naming somebody else without the operator token is refused with
both ids in the message.

The visibility rule was leaking before this: browse had none at all, and the
search rules short-circuited to the whole library whenever no holder was
named. The rule is now written out in five copies with one parameter carried
four times, and a test compares the copies so they cannot drift — semgrep
rejects an interpolated constant, so the copies are not a choice.

Eyes carry three states on purpose. NULL means the whole library, which is
what a process that owns the store is entitled to; a holder id means that
holder; the empty string means nobody, which is what a tokenless HTTP caller
is. Making NULL mean nobody instead would have forced every internal caller —
CLI, proofs, the compiler, the bench harnesses — to name eyes, contradicting
the rule that a local process reads as its own trusted principal.

The capability card answers "can this store answer my kind of question" before
anything is sent. It is derived from what the store holds, so it cannot
promise a modality the store lacks, and it carries no memory text, so it is
safe to read before trusting the store. HTTP, CLI and one MCP tool all serve
it without a token.

backend/tests/test_product_api.py

@@ -18,6 +18,8 @@ from ely_eye.storage import ObjectStore
 
 PNG = b"\x89PNG\r\n\x1a\n"
 BASE = datetime(2026, 5, 1, 12, 0, tzinfo=UTC)
+OPERATOR = "the-shelf-owner"
+AS_OWNER = {"Authorization": f"Bearer {OPERATOR}"}
 
 HTTP_SURFACE = {
     "/api/adapters",
@@ -32,11 +34,14 @@ HTTP_SURFACE = {
     "/api/cartridges/{cartridge_id}/refresh",
     "/api/cartridges/{cartridge_id}/switch",
     "/api/cartridges/{cartridge_id}/unmount",
+    "/api/card",
+    "/api/card/{holder_id}",
     "/api/chat",
     "/api/hashhop",
     "/api/holders",
     "/api/holders/{holder_id}",
     "/api/holders/{holder_id}/knows",
+    "/api/holders/{holder_id}/token",
     "/api/ingest/path",
     "/api/ingest/upload",
     "/api/memory",
@@ -57,7 +62,7 @@ HTTP_SURFACE = {
 
 @pytest.fixture
 def settings(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> Settings:
-    resolved = Settings(home=tmp_path, default_holder="wife")
+    resolved = Settings(home=tmp_path, default_holder="wife", auth_token=OPERATOR)
     monkeypatch.setattr(api_module, "get_settings", lambda: resolved)
     Database(resolved).init()
     return resolved
@@ -106,14 +111,15 @@ def _seed(settings: Settings, pictures: int = 3) -> None:
 
 def test_the_store_pages_newest_first_and_says_how_much_is_left(client: TestClient, settings: Settings) -> None:
     _seed(settings)
-    first = client.get("/api/atoms", params={"limit": 2})
+    # A tokenless caller is nobody and would see none of these; this test reads the shelf as its owner.
+    first = client.get("/api/atoms", params={"limit": 2}, headers=AS_OWNER)
     assert first.status_code == 200
     page = first.json()
     assert page["total"] == 3
     assert [atom["atom_id"] for atom in page["atoms"]] == ["shot2:frame", "shot1:frame"]
     assert page["next_cursor"]
 
-    second = client.get("/api/atoms", params={"limit": 2, "cursor": page["next_cursor"]})
+    second = client.get("/api/atoms", params={"limit": 2, "cursor": page["next_cursor"]}, headers=AS_OWNER)
     rest = second.json()
     assert [atom["atom_id"] for atom in rest["atoms"]] == ["shot0:frame"]
     assert rest["next_cursor"] is None, "the last page must not promise another one"
@@ -125,11 +131,11 @@ def test_browse_narrows_by_modality_and_by_holder(client: TestClient, settings:
         "the keys are on the shelf", holder_id="wife", origin=MemoryOrigin.self_
     )
 
-    images = client.get("/api/atoms", params={"modality": "image"}).json()
+    images = client.get("/api/atoms", params={"modality": "image"}, headers=AS_OWNER).json()
     assert images["total"] == 2
     assert {atom["modality"] for atom in images["atoms"]} == {"image"}
 
-    his = client.get("/api/atoms", params={"holder": "husband"}).json()
+    his = client.get("/api/atoms", params={"holder": "husband"}, headers=AS_OWNER).json()
     assert [atom["atom_id"] for atom in his["atoms"]] == ["shot1:frame"]
 
 
@@ -142,7 +148,7 @@ def test_an_unreadable_cursor_is_refused_with_400(client: TestClient, settings:
 
 def test_a_picture_atom_serves_the_bytes_behind_it(client: TestClient, settings: Settings) -> None:
     _seed(settings, pictures=1)
-    response = client.get("/api/atoms/shot0:frame/image")
+    response = client.get("/api/atoms/shot0:frame/image", headers=AS_OWNER)
     assert response.status_code == 200
     assert response.content == PNG
     assert response.headers["content-type"] == "image/png"
@@ -152,15 +158,15 @@ def test_a_memory_with_no_picture_says_so(client: TestClient, settings: Settings
     atom = MemoryService(settings, Database(settings)).remember(
         "the keys are on the shelf", holder_id="wife", origin=MemoryOrigin.self_
     )
-    assert client.get(f"/api/atoms/{atom.atom_id}/image").status_code == 404
-    assert client.get("/api/atoms/nope:image").status_code == 404
+    assert client.get(f"/api/atoms/{atom.atom_id}/image", headers=AS_OWNER).status_code == 404
+    assert client.get("/api/atoms/nope:image", headers=AS_OWNER).status_code == 404
 
 
 def test_a_forgotten_picture_stops_being_served(client: TestClient, settings: Settings) -> None:
     _seed(settings, pictures=1)
     MemoryService(settings, Database(settings)).forget(atom_id="shot0:frame")
-    assert client.get("/api/atoms/shot0:frame/image").status_code == 404
-    assert client.get("/api/atoms").json()["total"] == 0
+    assert client.get("/api/atoms/shot0:frame/image", headers=AS_OWNER).status_code == 404
+    assert client.get("/api/atoms", headers=AS_OWNER).json()["total"] == 0
 
 
 def test_status_says_what_the_machine_can_see_and_what_it_cannot(client: TestClient, settings: Settings) -> None: