chore(version): bump VERSION 0.1.15 → 0.1.16 (release prep)

[mvalancy]

0.1.16 — notification center + polish. Work since 0.1.15:

• feat(health): offline notification center — bell/inbox with persistent dismiss + routing self-heal events into the box's own mail/board/chat (last open scope of #28) #69 slice 1 (PR feat(notify): aggregating notification bell/inbox for self-heal events (#69 slice 1) #120): aggregating notification bell/inbox for self-heal events (read-gated /api/status/notifications; filters; persistent dismiss).
• Polish batch (PR fix: polish & hardening — notify inbox data-id (#121), catalog empty-feed (#95), loop-lock test (#96) #122): harden(web-ui): notification inbox passes id via inline onclick — safe today only by server id-constraint, not esc(); use data-id + delegation #121 notify-inbox attribute-XSS hardening (escAttr, corrected docs — the review caught + fixed a false safety invariant), fix(catalog): treat an HTTP-200 empty feed for a configured language as INCOMPLETE (don't replace a fuller cache) #95 catalog HTTP-200 empty-feed → incomplete (preserves fix(catalog): partial Kiwix OPDS success silently replaces the full multi-language cache (and the web catalog shell-out can rewrite it English-only) #57), test(loop): strengthen #81 lock-leak coverage — assert operative 8>&- (not comment) + functional services/*.sh spawn test #96 loop-lock test coverage.

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