docs: clear briefing remnants and document journal system

The Briefing system was retired weeks ago and replaced with the
conversational Journal, but several current-state docs still
described it as live. Updates:

architecture.md
- settings keys: briefing_enabled / briefing_locations / office_days →
  journal_config (JSON: locations, temp_unit, prep schedule)
- conversation_type: chat/briefing/mcp → chat/journal/mcp
- briefing_date column → day_date on Conversation
- "Briefing-Related Tables" section: dropped rss_feeds + rss_items
  rows (retired with PR #43); kept weather_cache and clarified that
  lat/lon now live in journal_config.locations, not on the cache row
- routes/chat.py description: dropped trailing "briefing conversation
  routes" mention
- routes/briefing.py → routes/journal.py with the current endpoint
  shape (config / today / day / days / weather / moments / trigger-
  prep)
- services/briefing_pipeline + scheduler + conversations + profile →
  services/journal_prep + journal_pipeline + journal_scheduler +
  journal_search/moments + user_profile.build_profile_context

features.md
- "Daily Briefing" section rewritten as "Daily Journal":
  conversational, single morning prep, right rail with weather +
  upcoming events, profile-tab configuration, "what the assistant
  has learned" framing
- Settings table: dropped Briefing tab row, added Profile tab row,
  fixed Notifications row's stale briefing-push reference

api-reference.md
- /api/briefing/* endpoints replaced with /api/journal/* — config,
  today/day/days, trigger-prep, weather (cached/current/refresh/
  geocode), moments

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

docs/features.md

@@ -52,19 +52,22 @@ Full conversation history with SSE streaming. Features:
 - **Bulk delete** — Select and delete multiple conversations.
 - **Retention** — Conversations auto-pruned after configurable days (default 90).
 
-## Daily Briefing
+## Daily Journal
 
-`/briefing` is a scheduled, dialogue-based morning briefing. The assistant compiles tasks, calendar events, projects, weather forecast, and RSS digest at configurable times, then checks in throughout the day. You can reply interactively.
+`/journal` is a conversational daily surface — each day is a chat-style conversation seeded with an LLM-generated daily prep as the first assistant message. The prep pulls together today's tasks, calendar events, weather, recent moments, and active projects in flowing prose, then invites the user to continue the conversation throughout the day.
 
-**Schedule** — Configurable slots: morning (default 4am compile), midday (8am check-in), evening (12pm check-in), night (4pm). Scheduler catches up missed slots on startup.
+**Schedule** — Daily prep generates at a configurable time (default 5:00am). The "day rollover hour" controls when the journal switches to a new day (default 4am — late-night entries 1–3am still count as the previous day). Scheduler catches up missed runs on startup.
 
-**Configuration** — Settings → Briefing: enable toggle, location geocoding, office days, time slot toggles, RSS feed management, push notification toggle.
+**Right rail** — The journal view shows current weather conditions and upcoming events for the next two weeks alongside the conversation. Both surfaces draw from the same data the prep references.
 
-**RSS feeds** — Add feed URLs with optional name and category. Feeds are fetched and cached; the briefing digest includes recent items. Category badges shown in the UI. Feeds can be manually refreshed.
+**Configuration** — Settings → Profile:
+- *Locations* section: home and work place-name inputs (geocoded on blur via Nominatim) and a temperature unit toggle (C/F)
+- *Journal* section: prep auto-generate toggle, prep generation time, day rollover hour
+- *About You* / *Interests* / *Work Schedule* / *Response Preferences* feed personalization into the prep's system prompt
 
-**Weather** — Location-based forecast via Open-Meteo. Multiple locations supported (home, work, or any city name). Geocoding via Nominatim.
+**Weather** — Location-based forecast via Open-Meteo. Up to two named locations (home, work). Cached rows auto-refresh in the background when the journal page loads.
 
-**Profile note** — The assistant maintains a profile note for each user that it updates based on briefing conversations, improving personalisation over time.
+**What the assistant has learned** — The assistant maintains a per-user observation log + consolidated summary, generated from journal and chat conversations. The summary is included in the journal's system prompt so the daily prep can reference what it knows about you over time.
 
 ## Web Research
 
@@ -115,10 +118,10 @@ Settings are tabbed:
 |-----|----------|
 | General | Assistant name, default model, model management (pull/delete) |
 | Account | Email change, password change, session invalidation |
-| Notifications | Push notification subscription, briefing push toggle |
+| Notifications | Push notification subscription, journal prep push toggle |
+| Profile | About you, response preferences, interests, work schedule, locations + temperature unit, journal prep schedule, learned observations |
 | Integrations | CalDAV configuration, SearXNG status |
 | Data | Personal export, backup/restore (admin) |
-| Briefing | Enable, location, office days, slots, RSS feeds, weather |
 | API Keys | Create/revoke API keys, Fable MCP download and install |
 | Config (admin) | Base URL, SMTP, OIDC settings |
 | Users (admin) | User list, invite links, registration toggle |