docs: relocate v0 design specs to docs/design/

I moved both v0 design specs out of working/ and into docs/design/. That's the conventional permanent home for project documentation, where engineers will look during implementation. working/ is meant for transient in-progress artifacts that file away once the work ships, and these specs are long-lived design docs that don't fit that contract.

Files moved:
- working/stats-dashboard/stats-dashboard.org → docs/design/stats-dashboard.org
- working/fsrs-spec/fsrs-spec.org → docs/design/fsrs-spec.org

The git rename detection picked both up, so file history follows the move.

I also dropped the stale /docs entry from .gitignore. The Makefile doesn't write to docs/ and nothing else references it as a build output, so the ignore was inherited cruft that would have silently dropped any tracked file under docs/.

I updated path references in seven spots: three docstring/comment refs in org-drill.el, one in tests/test-org-drill-session-record.el (the Commentary block), and three inside the specs themselves. Two refs in fsrs-spec.org now point at the correct location for its defcustom docstring and option description. One in stats-dashboard.org's References section points at the sister spec.

Full make test-unit green. eask compile clean.

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