Add ``m.event_id`` (T109's nullable column from migration 0014) to
``search_all_memories``'s SELECT, propagate it through the route's
template context, and have ``search.html`` build result links as
``/chats/{chat_id}#turn-{event_id}`` — matching the ``id="turn-{event_id}"``
anchor that Phase 3.5 T86 stamps on each turn DOM node so the chat page
scrolls to the originating turn on load. Memory rows projected before
the 0014 migration ran read NULL ``event_id``; the template falls back
to a chat-level link in that case so we never emit ``#turn-None``.
Pre-existing tests that asserted on the bare ``href="/chats/{chat_id}"``
contract are updated to assert on the ``href="/chats/{chat_id}#turn-``
prefix to reflect the new deep-link.
Replace the ``pov_summary`` column in ``search_all_memories``'s SELECT
with ``snippet(memories_fts, 0, '<mark>', '</mark>', '…', 32)`` so each
match in a result row is wrapped in ``<mark>`` for the search-results
UI. The original ``pov_summary`` is still returned alongside as a
non-highlighted fallback. Template renders ``r.snippet|safe`` — the only
HTML in the snippet output is the configured ``<mark>`` markers, so it
is safe to bypass Jinja's auto-escape.
Wires T93's `search_all_memories` service into a small read-only HTML
surface so users can find a memory across every chat in the database.
* `chat/web/search.py` (new): GET `/search?q=...` runs the FTS service
with k=50, hydrates each row with bot name + scene timestamp, and
renders `search.html`. Empty `q` short-circuits to no results so the
top-bar form can submit even with an empty input.
* `chat/templates/search.html` (new): empty-state placeholder, results
list with chat-level "Open chat" links (`/chats/{chat_id}` — memories
don't carry an event_id today, so no per-turn anchor).
* `chat/templates/layout.html`: append a small `<form>` to the rail
nav, additive only.
* `chat/app.py`: register `search_router` (additive import + include).
* `tests/test_search_ux.py`: 3 tests — multi-chat results, empty-query
placeholder, chat link.
Joseph Doherty