feat: add rename-ai-artifact tool and rename the drill-deck family to flashcard

Renaming an .ai artifact by hand is the kind of mechanical job that gets done incompletely: the canonical copy moves but the mirror doesn't, a reference in the INDEX is missed, a trigger phrase points at the old name. I'd also assumed a rename was costly because references scatter, when the index update is trivial and the drift check already guards it. So I built the discipline into a script instead of re-deriving it each time.

scripts/rename-ai-artifact.sh takes old and new basenames, moves the file in both the canonical and mirror trees, and rewrites every reference repo-wide on a token boundary so renaming "foo" can't corrupt "foobar" or "foo-bar". It rewrites the underscore module-name variant too (a hyphenated script imported as foo_bar via importlib), leaves the archived session records under sessions/ alone because they're history, and runs workflow-integrity + sync-check at the end to prove no drift. rename-artifact.org documents it and indexes the triggers.

Then I used the tool to do the rename that prompted it: the org-drill deck workflow and its helpers are now flashcard-named, since "flashcard" is the word you'd actually search for. The renamed set is flashcard-review.org plus flashcard-stats.py, flashcard-sync, flashcard-to-anki.py, and flashcard-diff-ids.py, with their tests, every reference, and the INDEX entry updated. The deck is still an org-drill deck under the hood, so the ":drill:" tag handling and the "drill deck" trigger phrases stay. I added "review/update the flashcards" alongside them.

Tests: 9 bats for the rename tool (including the prefix-collision and history-preservation edges), and the renamed script suites all pass under make test.

1 files changed, 109 insertions, 0 deletions

diff --git a/.ai/scripts/tests/test_flashcard_diff_ids.py b/.ai/scripts/tests/test_flashcard_diff_ids.py
new file mode 100644
index 0000000..9554b48
--- /dev/null
+++ b/.ai/scripts/tests/test_flashcard_diff_ids.py
@@ -0,0 +1,109 @@
+"""Tests for flashcard-diff-ids.py: :ID: extraction + SRS-state diff CLI.
+
+Plain python3 script (no third-party deps), so card_id_map imports directly;
+the disappeared/appeared reporting is exercised through the CLI.
+"""
+from __future__ import annotations
+
+import importlib.util
+import subprocess
+import sys
+from pathlib import Path
+
+import pytest
+
+SCRIPT = Path(__file__).resolve().parents[1] / "flashcard-diff-ids.py"
+
+
+@pytest.fixture(scope="module")
+def diff_ids():
+    spec = importlib.util.spec_from_file_location("flashcard_diff_ids", SCRIPT)
+    assert spec and spec.loader
+    module = importlib.util.module_from_spec(spec)
+    spec.loader.exec_module(module)
+    return module
+
+
+DECK_A = """* Section
+** What is DeepSat? :drill:
+:PROPERTIES:
+:ID: id-1
+:END:
+Body.
+** Who founded it? :drill:
+:PROPERTIES:
+:ID: id-2
+:END:
+Body.
+"""
+
+# id-2 dropped, id-3 added relative to DECK_A
+DECK_B = """* Section
+** What is DeepSat? :drill:
+:PROPERTIES:
+:ID: id-1
+:END:
+Body.
+** When was it founded? :drill:
+:PROPERTIES:
+:ID: id-3
+:END:
+Body.
+"""
+
+
+def test_card_id_map_extracts_id_to_heading(diff_ids, tmp_path):
+    f = tmp_path / "a.org"
+    f.write_text(DECK_A)
+    m = diff_ids.card_id_map(f)
+    assert set(m) == {"id-1", "id-2"}
+    assert m["id-1"] == "What is DeepSat?"
+
+
+def _run(before, after):
+    return subprocess.run(
+        [sys.executable, str(SCRIPT), str(before), str(after)],
+        capture_output=True, text=True,
+    )
+
+
+def test_cli_identical_decks_exit_zero(tmp_path):
+    a = tmp_path / "a.org"
+    a.write_text(DECK_A)
+    b = tmp_path / "b.org"
+    b.write_text(DECK_A)
+    r = _run(a, b)
+    assert r.returncode == 0
+    assert "preserved" in r.stdout.lower()
+
+
+def test_cli_dropped_id_warns_and_exits_one(tmp_path):
+    a = tmp_path / "a.org"
+    a.write_text(DECK_A)
+    b = tmp_path / "b.org"
+    b.write_text(DECK_B)
+    r = _run(a, b)
+    assert r.returncode == 1
+    assert "disappeared" in r.stdout.lower()
+    assert "id-2" in r.stdout
+
+
+DECK_ONE = """* Section
+** What is DeepSat? :drill:
+:PROPERTIES:
+:ID: id-1
+:END:
+Body.
+"""
+
+
+def test_cli_appeared_only_notes_new_ids_and_exits_one(tmp_path):
+    # before has id-1; after adds id-2 and drops nothing.
+    before = tmp_path / "before.org"
+    before.write_text(DECK_ONE)
+    after = tmp_path / "after.org"
+    after.write_text(DECK_A)
+    r = _run(before, after)
+    assert r.returncode == 1
+    assert "appeared" in r.stdout.lower()
+    assert "id-2" in r.stdout