Propose social MVP: public-content-visibility + demo-activity-bot

Two stacked OpenSpec change proposals for a demoable social layer,
with scope deliberately minimal ("enough to send a URL and have it
open to real-looking content without signup"):

1. public-content-visibility
   - Adds visibility enum {private, unlisted, public} on routes +
     activities, defaulting to private for every existing row.
   - Detail pages (/routes/:id, /activities/:id) become accessible to
     logged-out visitors when content is public or unlisted; private
     → 404 (not 403) to avoid existence leaks.
   - Broadens /users/:username into a public profile listing only
     public routes + activities; 404s when there's no public content
     to prevent account enumeration.
   - Open Graph / Twitter Card meta on public detail + profile pages.
   - Visibility selector in the owner's edit flow.
   - Out of scope: follow/follower, cross-user feed, reactions,
     federation.

2. demo-activity-bot  (depends on #1)
   - A single bot user, Bruno the trail dog, seeded on worker startup
     when DEMO_BOT_ENABLED=true. Reserved username, sentinel email,
     no credentials.
   - pg-boss recurring job fires every 90 min, decides-to-walk with
     p=0.12 during 07:00-21:00 local, yielding ~2-3 walks/day at
     organic times.
   - Each walk: random start + end within inner-Berlin bbox, trekking
     only (dogs don't ride bikes), 2-12 km crow. BRouter plans the
     route; the route GPX is also attached as the activity's trace.
   - Everything inserted with visibility=public, synthetic=true.
   - Daily prune deletes synthetic rows > DEMO_BOT_RETENTION_DAYS old
     (default 14). Hard cap of 40 items/14d protects against runaway
     growth.
   - Small "🐕 demo account" badge on /users/bruno for honesty.

Both changes are artifacts only — no code lands with this PR. Apply
in order after merge: public-content-visibility first, then
demo-activity-bot.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

openspec/changes/public-content-visibility/tasks.md

@@ -0,0 +1,62 @@
+## 1. Schema
+
+- [ ] 1.1 Add `visibility text NOT NULL DEFAULT 'private'` to `journal.routes` in `packages/db/src/schema/journal.ts`
+- [ ] 1.2 Add the same column to `journal.activities` in the same file
+- [ ] 1.3 Export a shared type `type Visibility = 'private' | 'unlisted' | 'public'` from `packages/db/src/schema/journal.ts` (or a small adjacent module) and reuse at the app layer
+
+## 2. Server-side access helper
+
+- [ ] 2.1 Add `canView(content, user)` in `apps/journal/app/lib/auth.server.ts` that returns `true` for `public`, `true` for `unlisted` (the direct-URL case — callers pass `true` when routed to a detail page, `false` when generating listings), and ownership-checked otherwise
+- [ ] 2.2 Unit test the three matrix cells
+
+## 3. Route detail access
+
+- [ ] 3.1 Update `apps/journal/app/routes/routes.$id.tsx` loader: fetch route, then apply `canView`; return 404 when not allowed
+- [ ] 3.2 Expose `visibility` on the loader's returned shape so the component can render the current-visibility badge to the owner
+- [ ] 3.3 Emit Open Graph / Twitter Card `meta` for `public` and `unlisted` routes (title, description, `og:type="article"`, `og:site_name="trails.cool"`, `twitter:card="summary"`)
+
+## 4. Activity detail access
+
+- [ ] 4.1 Mirror 3.1 in `apps/journal/app/routes/activities.$id.tsx`
+- [ ] 4.2 Mirror 3.3 for activities
+
+## 5. Visibility selector in the edit flow
+
+- [ ] 5.1 Add a visibility `<select>` to `apps/journal/app/routes/routes.$id.edit.tsx`
+- [ ] 5.2 Wire the form action in `routes.$id.tsx` / the edit route to persist the new value via `updateRoute`
+- [ ] 5.3 Add i18n keys (EN + DE) for `routes.visibility.{label,private,unlisted,public,privateHelp,unlistedHelp,publicHelp}`
+- [ ] 5.4 Do the same for activities (no separate edit page exists yet — either add a minimal one or surface the selector on the detail page for the owner; pick during implementation)
+
+## 6. Listing filters
+
+- [ ] 6.1 Update `listRoutes(userId)` in `apps/journal/app/lib/routes.server.ts` to accept a `viewerUserId: string | null` and filter to rows where `visibility='public'` OR `owner_id = viewerUserId`
+- [ ] 6.2 Same for `listActivities` in the activities equivalent
+- [ ] 6.3 Audit any other query that returns routes/activities across users and apply the same filter (grep `users.id` / `owner_id` joins)
+
+## 7. Public profile page
+
+- [ ] 7.1 Broaden `apps/journal/app/routes/users.$username.tsx` loader to not require auth
+- [ ] 7.2 Fetch the user row by username; return 404 if no such user
+- [ ] 7.3 Fetch that user's `public` routes and `public` activities via the updated listing filters
+- [ ] 7.4 Return 404 if the user exists but has no public content at all (prevents account enumeration)
+- [ ] 7.5 Render the profile header (display name, `@username@domain` handle), reverse-chronological lists, and an owner-only "This is your profile" control strip linking to settings
+- [ ] 7.6 Emit Open Graph meta (`og:title`, `og:site_name`, `og:type="profile"`)
+
+## 8. Copy + docs
+
+- [ ] 8.1 Add a short sentence to the Privacy Manifest (`legal.privacy.tsx`) noting public content is world-visible and exportable the same way
+- [ ] 8.2 Bump `PRIVACY_LAST_UPDATED` in `apps/journal/app/lib/legal.ts` and add a new snapshot under `docs/legal-archive/`
+
+## 9. Testing
+
+- [ ] 9.1 Unit: `canView` matrix (private/unlisted/public × owner/other/anon)
+- [ ] 9.2 E2E: logged-out visitor can view a public route page; gets 404 on a private one
+- [ ] 9.3 E2E: owner marks a route public, logs out, can still view it at the same URL
+- [ ] 9.4 E2E: `/users/:username` 404s for a user with no public content, renders for one with at least one public item
+- [ ] 9.5 E2E: OG tags are present on public detail pages (assert via `page.locator('meta[property="og:title"]')`)
+
+## 10. Rollout
+
+- [ ] 10.1 Merge schema + code; `drizzle-kit push --force` adds the column with `'private'` default — no row changes
+- [ ] 10.2 Confirm on prod that the three existing users' routes/activities are still auth-only (they should be, since all rows default to `private`)
+- [ ] 10.3 Hand off to `demo-activity-bot` which inserts with `visibility: 'public'` directly