docs: record four ADRs for gloss design decisions

The four decisions called out in the brainstorm now have their own
files under docs/decisions/, each with Context / Decision /
Consequences / Alternatives Considered.

- 0001 — storage path default: respects org-directory if set, falls
  back to user-emacs-directory.
- 0002 — auto-fetch on local miss: silent fall-through, network
  failures surface via the regular error rollup. No y/n prompt for
  v1.
- 0003 — drill direction: every entry exports as twosided. One card
  per entry, both directions over time, no per-entry override.
- 0004 — HTML strip strategy: libxml-parse-html-region. Plain text
  only, no italic/bold preservation. Online fetch disabled package-wide
  for the session if libxml is missing.

The "Open Questions" section in the design doc is now "Decisions
Recorded" with links into the ADRs.

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