Wiki: add librarian, strengthen prompt, fix delete button

[sysread]

=head1 SYNOPSIS

Three changes addressing observations from production traffic on the
just-shipped wiki:

• Delete button on the article view is blank - the local .danger
  CSS painted red text on a red background.
• The per-conversation agent generates one new article per
  conversation instead of updating existing ones.
• Add a second background agent (the librarian) that
  consolidates duplicates and fact-checks against conversation
  history.

=head1 PURPOSE

After the initial wiki ship landed, two issues surfaced in
production:

1. The Delete button on an open article had no visible label. CSS
   inspection showed the global button.danger rule fills the
   button red and uses light text, while the local .danger
   override I added re-set color to red - red text on red
   background = invisible.
2. The autonomous wiki agent was generating one wiki_create call
   per settled conversation - the per-thread invocation shape
   biased it hard toward "this conversation is its own topic, so
   write a new article". The wiki was accumulating near-duplicates
   instead of coherent topical pages.

The user also asked for a separate "librarian" agent whose job is
to organise the wiki by subject and fact-check articles against the
conversation history.

=head1 DESCRIPTION

=head2 Layer 1: how the existing wiki behaves

Wiki.svelte renders the open article with three trailing
buttons (Edit / Ask agent to update / Delete). The local
stylesheet block defines .danger { color: var(--error) } to
border-and-color the Delete button red. The global
button.danger rule already paints the button solid red with
contrasting light text via --ink-on-danger.

The autonomous wiki agent (src/lib/agents/wiki/) claims one
settled thread per cycle, builds a prompt out of
WIKI_AUTONOMOUS_PROMPT, and runs runHeadlessToolLoop against
wikiToolbox (search + create + update + delete). The prompt
told the agent to "search before write", but its workflow steps
landed equally on update vs create - and there was no instruction
to retry the search with different angles before falling back to
create.

There is no second agent. Articles only mutate from the per-
conversation agent's tool calls or from manual user edits.

=head2 Layer 2: what this PR changes, parallel to layer 1

Delete button. Drop the local .danger block from
Wiki.svelte and inline a comment explaining why. The global
rule wins; the button now reads "Delete" in light text on the red
fill, matching the Memories panel's delete styling.

Autonomous prompt. Rewrite WIKI_AUTONOMOUS_PROMPT:

• New leading paragraph: "The single most important
  discipline: UPDATE is the default, CREATE is rare." Plus an
  explicit framing that zero edits is a normal outcome on
  chitchat / tactical conversations.
• Workflow step 1 now mandates "Search broadly first, with
  multiple query angles" - at least TWO different wiki_search
  calls with different phrasings before concluding nothing
  exists. Includes concrete examples ("kombucha" might already
  exist as "fermented drinks").
• Workflow step 2 emphasises: "Even a loosely-related existing
  article is usually the right home for new information". The
  goal is to extend rather than fragment.
• Workflow step 3 explicitly frames wiki_create as "the last
  resort", with three preconditions before firing.

The rationale block above the prompt now records the historical
"one article per conversation" failure mode so a future revisit
won't quietly relax the discipline.

Wiki librarian (the new agent):

• SQL: profiles.wiki_librarian_last_run_at column +
  claim_wiki_librarian_run(int) RPC. UPDATE-with-WHERE
  atomically returns true at most once per min_interval_seconds
  across all of a user's devices.
• Worker: src/lib/agents/wiki-librarian/{types,prompt,agent, loop,worker,manager}.ts. Lock name
  nak:wiki-librarian-worker, lease partition
  'wiki-librarian', defaults to 12h minimum interval and a
  1h idle nap.
• Toolbox: wikiLibrarianToolbox bundles wiki_search + wiki_update + wiki_delete + conversation_search. No
  wiki_create - the librarian only consolidates.
• Agent flow: snapshot all articles via listWikiArticles,
  project to (id, title, excerpt), render into the prompt,
  run runHeadlessToolLoop. Skips when fewer than 3 articles
  (LIBRARIAN_MIN_ARTICLES) or when the cross-device claim
  returned too-soon.
• Settings: new independent wikiLibrarianEnabled toggle on
  Settings -> Wiki. Default-on. The two toggles
  (wikiAutomaticEnabled and wikiLibrarianEnabled) are
  independent so the user can run one without the other.
• Model: pinned to deepseek-v4-flash (same as the per-
  conversation wiki agent and journal/reflection); rationale
  documented inline above AGENT_MODELS.

=head2 Layer 3: how that resolves PURPOSE

• The delete button now renders correctly. Same global treatment
  as every other delete button in the app.
• The autonomous agent now biases hard toward updating existing
  articles. New article creation should be rare; chitchat
  conversations should produce zero edits, which the prompt
  explicitly names as a correct outcome.
• The librarian provides a second pass over time: even if the
  per-conversation agent occasionally lets a duplicate slip
  through, the librarian's 12h cycle catches it, consolidates,
  and fact-checks against conversation history.

=head1 Notes for AI reviewers

• The librarian intentionally has no wiki_create. New articles
  flow from the per-conversation agent or the user. Removing this
  constraint would let the librarian invent articles at every
  cycle.
• Pointer-advance on the per-conversation wiki worker is still
  unconditional on done (no change). With the strengthened
  prompt, "no edits" cycles will be more common than before;
  that's deliberate.
• The 12-hour interval is enforced server-side by the claim RPC;
  client-side timing is just an optimisation to not spam Postgres.
  Two devices that both wake up will both call the RPC; only one
  succeeds.
• LIBRARIAN_MIN_ARTICLES = 3 is a soft floor - the librarian
  has nothing useful to do on a brand-new wiki with one or two
  articles. Bump if you want.

https://claude.ai/code/session_015XcR7xzLdij66ZbYERUdLH

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