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diff --git a/.ai/scripts/drill-deck-stats.py b/.ai/scripts/drill-deck-stats.py
deleted file mode 100755
index 04c3468..0000000
--- a/.ai/scripts/drill-deck-stats.py
+++ /dev/null
@@ -1,327 +0,0 @@
-#!/usr/bin/env python3
-"""Inventory + authoring-quality checks for an org-drill deck source file.
-
-Reports counts and flags two tiers of issue.
-
-Blocking WARNs (exit 1):
-- PROPERTIES drawer count not matching card count
-- Cards missing :ID: (risks SRS-state loss across rewrites)
-- `*** Answer` sub-headers (should be 0 per drill-deck-review.org)
-- Non-prompt headings (topic-as-heading not yet rewritten)
-- #+TITLE missing, or carrying source-tool jargon ("org-drill")
-- Answer leakage: a card whose question echoes most of its own answer
-  (Source: citation lines and created-date lines are excluded from the
-  overlap, and range/category cards that recall numbers are exempted)
-- Duplicate / near-duplicate fronts (interference between confusable cards)
-
-Non-blocking NOTEs (exit unaffected):
-- Overloaded backs (long answer — candidate to split into atomic cards)
-- List-shaped backs (enumeration — candidate to split or use overlapping cloze)
-- Binary yes/no prompts (low retrieval effort — candidate to reformulate)
-
-Exits 0 when no blocking warnings are present, 1 otherwise, 2 on bad usage.
-Use as a gate before regenerating the Anki deck or running drill-deck-sync.
-
-The fuzzy checks (leakage, duplicate, overloaded) are tuned by the LEAKAGE_*
-and BACK_WORD_LIMIT constants below; loosen them if a real deck trips false
-positives.
-
-Usage:
-  drill-deck-stats.py <file.org>
-"""
-from __future__ import annotations
-
-import re
-import sys
-from pathlib import Path
-
-CARD_RE = re.compile(r"^\*\*\s+(.+?)\s+:drill:\s*$")
-ANSWER_RE = re.compile(r"^\*\*\*\s+Answer\b")
-PROP_START_RE = re.compile(r"^\s*:PROPERTIES:\s*$")
-PROP_END_RE = re.compile(r"^\s*:END:\s*$")
-ID_RE = re.compile(r"^\s*:ID:\s+(\S+)\s*$")
-TITLE_RE = re.compile(r"^#\+TITLE:\s*(.+?)\s*$", re.IGNORECASE)
-SOURCE_TOOL_RE = re.compile(r"\borg[-\s]?drill\b", re.IGNORECASE)
-PLANNING_RE = re.compile(r"^\s*(SCHEDULED|DEADLINE|CLOSED):\s")
-SOURCE_LINE_RE = re.compile(r"^\s*source:\s", re.IGNORECASE)
-CREATED_LINE_RE = re.compile(r"^\s*:?created:?\s", re.IGNORECASE)
-RANGE_RE = re.compile(r"\d[^\n]*[-–—]\s*\d")
-THRESHOLD_RE = re.compile(r"[<>≤≥]\s*\d")
-BULLET_RE = re.compile(r"^\s*([-+*]|\d+[.)])\s+")
-BINARY_LEAD_RE = re.compile(
-    r"^\s*(is|are|was|were|does|do|did|can|could|should|would|will|has|have|had)\b",
-    re.IGNORECASE,
-)
-
-# A heading qualifies as "prompt form" if it contains `?` or starts with one of
-# these imperative verbs (directive prompts like "Spell these out" and
-# "Introduce yourself" are valid even without `?`).
-IMPERATIVE_VERBS = frozenset({
-    "spell", "describe", "explain", "name", "list", "give",
-    "show", "tell", "define", "compare", "identify", "outline",
-    "introduce", "walk", "state", "recite", "recall", "summarize",
-})
-
-# Function words ignored when comparing a question against its answer.
-STOPWORDS = frozenset({
-    "the", "a", "an", "is", "are", "was", "were", "of", "to", "in", "on",
-    "for", "and", "or", "with", "what", "who", "whom", "when", "where", "why",
-    "how", "which", "does", "do", "did", "tell", "me", "about", "their", "this",
-    "that", "it", "as", "at", "by", "be", "your", "you", "they", "them",
-})
-
-# Tuning knobs for the fuzzy checks.
-LEAKAGE_RATIO = 0.8     # share of a question's content words echoed in its answer
-LEAKAGE_MIN_WORDS = 3   # ignore very short questions, where overlap is noise
-BACK_WORD_LIMIT = 60    # words on a card back before it's flagged as overloaded
-
-
-def is_prompt_form(heading: str) -> bool:
-    """True if the heading reads as a question or imperative prompt."""
-    if "?" in heading:
-        return True
-    first_word = heading.split(None, 1)[0].lower().rstrip(":,;")
-    return first_word in IMPERATIVE_VERBS
-
-
-def content_words(text: str) -> set[str]:
-    """Lowercased alphanumeric tokens of length >= 3, minus stopwords."""
-    return {w for w in re.findall(r"[a-z0-9]+", text.lower())
-            if len(w) >= 3 and w not in STOPWORDS}
-
-
-def leakage_ratio(heading: str, body: str) -> float:
-    """Fraction of the question's content words that reappear in the answer.
-
-    A high ratio means the answer is largely restated in the question, so the
-    card can be answered by recognition rather than recall. Returns 0.0 for a
-    question with fewer than LEAKAGE_MIN_WORDS content words, where overlap is
-    just noise.
-    """
-    hw = content_words(heading)
-    if len(hw) < LEAKAGE_MIN_WORDS:
-        return 0.0
-    return len(hw & content_words(body)) / len(hw)
-
-
-def prose_body(body: str) -> str:
-    """Body with Source: citation and created-date lines removed.
-
-    Those lines are metadata, not the answer. A Source line's URL slug often
-    repeats the question's words, and a created date is bookkeeping — neither
-    should count toward answer-leakage overlap.
-    """
-    return "\n".join(
-        ln for ln in body.splitlines()
-        if not SOURCE_LINE_RE.match(ln) and not CREATED_LINE_RE.match(ln)
-    )
-
-
-def has_distinct_numeric_recall(heading: str, body: str) -> bool:
-    """True if the answer carries numeric ranges/thresholds the question lacks.
-
-    A range/category card ("What are the HbA1c ranges across normal,
-    prediabetes, and diabetes?") echoes its categories in the answer, but the
-    recalled content is the numbers, which the question doesn't give away — so
-    high word overlap isn't leakage.
-    """
-    body_nums = bool(RANGE_RE.search(body) or THRESHOLD_RE.search(body))
-    head_nums = bool(RANGE_RE.search(heading) or THRESHOLD_RE.search(heading))
-    return body_nums and not head_nums
-
-
-def is_leaky(heading: str, body: str) -> bool:
-    """True if a card leaks its answer, after excluding citation lines and
-    numeric-recall (range/category) cards."""
-    prose = prose_body(body)
-    if leakage_ratio(heading, prose) < LEAKAGE_RATIO:
-        return False
-    return not has_distinct_numeric_recall(heading, prose)
-
-
-def normalize_heading(heading: str) -> str:
-    """Collapse a heading to a comparison key (lowercase, alnum + single spaces)."""
-    return re.sub(r"\s+", " ", re.sub(r"[^a-z0-9 ]", " ", heading.lower())).strip()
-
-
-def is_binary_prompt(heading: str) -> bool:
-    """True for yes/no or 'A or B' prompts, which need little retrieval effort."""
-    if BINARY_LEAD_RE.match(heading):
-        return True
-    return bool(re.search(r"\bor\b", heading, re.IGNORECASE)) and heading.rstrip().endswith("?")
-
-
-def back_word_count(body: str) -> int:
-    return len(body.split())
-
-
-def is_list_back(body: str) -> bool:
-    """True if the answer body is mostly an org list (an enumeration card)."""
-    lines = [ln for ln in body.splitlines() if ln.strip()]
-    if len(lines) < 2:
-        return False
-    bullets = sum(1 for ln in lines if BULLET_RE.match(ln))
-    return bullets >= 2 and bullets * 2 >= len(lines)
-
-
-def parse_cards(lines: list[str]) -> tuple[list[dict], int]:
-    """Parse :drill: cards from org lines.
-
-    Returns (cards, prop_count). Each card is a dict with heading, has_id,
-    has_answer, and body (the answer text with PROPERTIES drawers, planning
-    lines, and `*** Answer` headers removed, approximating the rendered back).
-    """
-    cards: list[dict] = []
-    prop_count = 0
-    i = 0
-    n = len(lines)
-    while i < n:
-        m = CARD_RE.match(lines[i])
-        if not m:
-            i += 1
-            continue
-        heading = m.group(1).strip()
-        i += 1
-        has_id = False
-        has_answer = False
-        in_drawer = False
-        body_lines: list[str] = []
-        while i < n:
-            line = lines[i]
-            if line.startswith("* ") or CARD_RE.match(line):
-                break
-            if PROP_START_RE.match(line):
-                prop_count += 1
-                in_drawer = True
-            elif in_drawer and PROP_END_RE.match(line):
-                in_drawer = False
-            elif in_drawer:
-                if ID_RE.match(line):
-                    has_id = True
-            elif ANSWER_RE.match(line):
-                has_answer = True
-            elif PLANNING_RE.match(line):
-                pass
-            else:
-                body_lines.append(line)
-            i += 1
-        cards.append({
-            "heading": heading,
-            "has_id": has_id,
-            "has_answer": has_answer,
-            "body": "\n".join(body_lines).strip(),
-        })
-    return cards, prop_count
-
-
-def find_duplicate_fronts(cards: list[dict]) -> list[tuple[str, str]]:
-    """Return (first, dup) heading pairs that normalize to the same key."""
-    seen: dict[str, str] = {}
-    dups: list[tuple[str, str]] = []
-    for c in cards:
-        key = normalize_heading(c["heading"])
-        if not key:
-            continue
-        if key in seen:
-            dups.append((seen[key], c["heading"]))
-        else:
-            seen[key] = c["heading"]
-    return dups
-
-
-def main() -> int:
-    if len(sys.argv) != 2:
-        print(f"usage: {sys.argv[0]} <file.org>", file=sys.stderr)
-        return 2
-
-    path = Path(sys.argv[1]).expanduser().resolve()
-    if not path.is_file():
-        print(f"error: {path} not found", file=sys.stderr)
-        return 2
-
-    lines = path.read_text(encoding="utf-8").splitlines()
-
-    title: str | None = None
-    for line in lines[:20]:
-        m = TITLE_RE.match(line)
-        if m:
-            title = m.group(1).strip()
-            break
-
-    cards, prop_count = parse_cards(lines)
-
-    no_id = [c["heading"] for c in cards if not c["has_id"]]
-    not_prompt = [c["heading"] for c in cards if not is_prompt_form(c["heading"])]
-    answer_count = sum(1 for c in cards if c["has_answer"])
-    leaky = [c["heading"] for c in cards if is_leaky(c["heading"], c["body"])]
-    dups = find_duplicate_fronts(cards)
-    overloaded = [c["heading"] for c in cards if back_word_count(c["body"]) > BACK_WORD_LIMIT]
-    listy = [c["heading"] for c in cards if is_list_back(c["body"])]
-    binary = [c["heading"] for c in cards if is_binary_prompt(c["heading"])]
-
-    print(f"{path.name} — drill deck stats")
-    print()
-    print(f"Deck title: {title if title else '(no #+TITLE)'}")
-    print(f"Cards: {len(cards)}")
-    drawer_status = "match" if prop_count == len(cards) else f"mismatch (expected {len(cards)})"
-    print(f"PROPERTIES drawers: {prop_count} ({drawer_status})")
-    print(f"*** Answer sub-headers: {answer_count} ({'clean' if answer_count == 0 else 'workflow violation'})")
-    print(f"Cards missing :ID:: {len(no_id)}")
-    print(f"Cards with non-prompt heading: {len(not_prompt)}")
-    print(f"Cards with possible answer leakage: {len(leaky)}")
-    print(f"Duplicate / near-duplicate fronts: {len(dups)}")
-    print()
-
-    warnings = 0
-
-    def emit_list(items: list[str]) -> None:
-        for h in items[:5]:
-            print(f"      - {h}")
-        if len(items) > 5:
-            print(f"      - ... and {len(items) - 5} more")
-
-    def warn(msg: str, items: list[str] | None = None) -> None:
-        nonlocal warnings
-        warnings += 1
-        print(f"WARN: {msg}")
-        if items:
-            emit_list(items)
-
-    def note(msg: str, items: list[str] | None = None) -> None:
-        print(f"NOTE: {msg}")
-        if items:
-            emit_list(items)
-
-    if title is None:
-        warn("no #+TITLE: line found; deck name will fall back to the file basename")
-    elif SOURCE_TOOL_RE.search(title):
-        warn(f"#+TITLE contains source-tool jargon ('{title}'); the deck name shows in Anki — drop 'Org-Drill' for a name that reads well on the consumption side")
-    if answer_count:
-        warn(f"{answer_count} cards have *** Answer sub-headers (drop per drill-deck-review.org)")
-    if prop_count != len(cards):
-        warn(f"PROPERTIES count {prop_count} does not match card count {len(cards)}")
-    if no_id:
-        warn(f"{len(no_id)} cards missing :ID:; losing identity risks SRS-state loss across rewrites", no_id)
-    if not_prompt:
-        warn(f"{len(not_prompt)} cards have non-prompt headings (no '?' and no imperative-verb start); likely topic-as-heading not yet rewritten", not_prompt)
-    if leaky:
-        warn(f"{len(leaky)} cards may leak their answer (question echoes >= {int(LEAKAGE_RATIO * 100)}% of its own answer's key words); reformulate so the answer is recalled, not recognized", leaky)
-    if dups:
-        warn(f"{len(dups)} duplicate / near-duplicate fronts (interference between confusable cards); disambiguate or merge",
-             [f"{a}  ==  {b}" for a, b in dups])
-
-    if overloaded:
-        note(f"{len(overloaded)} cards have a long answer (> {BACK_WORD_LIMIT} words); candidates to split into atomic cards", overloaded)
-    if listy:
-        note(f"{len(listy)} cards have a list-shaped answer; enumeration cards recall poorly — candidates to split or use overlapping cloze", listy)
-    if binary:
-        note(f"{len(binary)} cards are binary (yes/no or 'A or B'); low retrieval effort — candidates to reformulate open-ended", binary)
-
-    if warnings == 0:
-        print("clean (with non-blocking notes above)" if (overloaded or listy or binary) else "clean")
-        return 0
-    return 1
-
-
-if __name__ == "__main__":
-    raise SystemExit(main())