Add archive relay query augmentation and access-based GC (v0.45.0)

- Add async archive relay querying (local results immediate, archives in background)
- Add query caching with filter normalization to avoid repeated requests
- Add session-deduplicated access tracking for events
- Add continuous garbage collection based on access patterns
- Auto-detect storage limit (80% of filesystem) when ORLY_MAX_STORAGE_BYTES=0
- Support NIP-50 search queries to archive relays

New environment variables:
- ORLY_ARCHIVE_ENABLED: Enable archive relay query augmentation
- ORLY_ARCHIVE_RELAYS: Comma-separated archive relay URLs
- ORLY_ARCHIVE_TIMEOUT_SEC: Archive query timeout
- ORLY_ARCHIVE_CACHE_TTL_HRS: Query deduplication window
- ORLY_GC_ENABLED: Enable access-based garbage collection
- ORLY_MAX_STORAGE_BYTES: Max storage (0=auto 80%)
- ORLY_GC_INTERVAL_SEC: GC check interval
- ORLY_GC_BATCH_SIZE: Events per GC cycle

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

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

pkg/wasmdb/access_tracking.go

@@ -0,0 +1,24 @@
+//go:build js && wasm
+
+package wasmdb
+
+// RecordEventAccess is a stub for WasmDB.
+// Access tracking is not implemented for the WebAssembly backend as it's
+// primarily used for client-side applications where storage management
+// is handled differently.
+func (w *W) RecordEventAccess(serial uint64, connectionID string) error {
+	// No-op for WasmDB
+	return nil
+}
+
+// GetEventAccessInfo is a stub for WasmDB.
+func (w *W) GetEventAccessInfo(serial uint64) (lastAccess int64, accessCount uint32, err error) {
+	// No-op for WasmDB - return zeros
+	return 0, 0, nil
+}
+
+// GetLeastAccessedEvents is a stub for WasmDB.
+func (w *W) GetLeastAccessedEvents(limit int, minAgeSec int64) (serials []uint64, err error) {
+	// No-op for WasmDB - return empty slice
+	return nil, nil
+}