feat(scripts): add drill-to-anki.py template script (org-drill to Anki .apkg)

Generalizes the health-drill-to-anki.py converter into a template
script under claude-templates/.ai/scripts/. Every project's startup
rsync now picks it up at .ai/scripts/drill-to-anki.py.

The converter walks an org-drill file. Top-level * Section headings
become Anki tags. Each ** Card name :drill: entry becomes a card
with the heading as Front and the body as Back (newlines converted
to <br>).

Parameterized from the original health-specific version:
- Input file is a positional argument (was hardcoded
  health-drill.org).
- Deck name defaults to the org file's #+TITLE if present, else the
  input basename in Title Case (was hardcoded "Health Drill").
- Output path defaults to ~/sync/org/drill/<input-basename>.apkg
  (was hardcoded health-drill.apkg in the same dir).
- Deck and model IDs are derived from the deck name via SHA-256, so
  re-running against the same source produces stable IDs. Anki
  imports update existing cards in place rather than duplicating.

Dependencies via PEP 723 inline script metadata. The shebang is
#!/usr/bin/env -S uv run --script. First run resolves and caches
genanki>=0.13. Subsequent runs are instant. There is no venv to
maintain and no PEP 668 friction.

Smoke tested against ~/projects/health/health-drill.org. The script
wrote 43 cards into the Health Drill deck, matching the original
script's output.

Inbox source: 2026-05-29-1114-from-health-todo-b-org-drill-anki-export-updated.org.
Craig confirmed all projects will likely have org-drill files,
justifying template-tier promotion.

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