feat: implement Event Log Projection & View (Step 8.2)

- Add migration 0008 for event_log_by_location table with cap trigger
- Create EventLogProjection for location-scoped event summaries
- Add GET /event-log route with location_id filtering
- Create event log templates with timeline styling
- Register EventLogProjection in eggs, feed, and move routes
- Cap events at 500 per location (trigger removes oldest)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

migrations/0008-event-log-by-location.sql

@@ -0,0 +1,27 @@
+-- ABOUTME: Migration to create event_log_by_location table with cap trigger.
+-- ABOUTME: Stores event summaries per location, capped at 500 per location.
+
+-- Event log table for location-scoped event summaries
+CREATE TABLE event_log_by_location (
+    event_id TEXT PRIMARY KEY,
+    location_id TEXT NOT NULL REFERENCES locations(id),
+    ts_utc INTEGER NOT NULL,
+    type TEXT NOT NULL,
+    actor TEXT NOT NULL,
+    summary TEXT NOT NULL CHECK(json_valid(summary))
+);
+
+-- Index for efficient queries by location and time (newest first)
+CREATE INDEX idx_evlog_loc_ts ON event_log_by_location(location_id, ts_utc DESC);
+
+-- Trigger to cap events at 500 per location (keeps newest 500)
+CREATE TRIGGER trg_evlog_cap AFTER INSERT ON event_log_by_location
+BEGIN
+    DELETE FROM event_log_by_location
+    WHERE rowid IN (
+        SELECT rowid FROM event_log_by_location
+        WHERE location_id = NEW.location_id
+        ORDER BY ts_utc DESC
+        LIMIT -1 OFFSET 500
+    );
+END;