feat(config): Add fetchResourceEvents config flag with --no-events CLI override

Adds a new boolean field to SyncConfig that controls whether resource
event fetching is performed during sync:

- SyncConfig.fetch_resource_events: defaults to true via serde
  default_true helper, serialized as "fetchResourceEvents" in JSON
- SyncArgs.no_events: --no-events CLI flag that overrides the config
  value to false when present
- SyncOptions.no_events: propagates the flag through the sync pipeline
- handle_sync_cmd: mutates loaded config when --no-events is set,
  ensuring the flag takes effect regardless of config file contents

This follows the existing pattern established by --no-embed and
--no-docs flags, where CLI flags override config file defaults.
The config is loaded as mutable specifically to support this override.

Also adds "events" to the count command's entity type value_parser,
enabling `lore count events` (implementation in a separate commit).

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

src/core/config.rs

@@ -50,6 +50,13 @@ pub struct SyncConfig {
 
     #[serde(rename = "dependentConcurrency")]
     pub dependent_concurrency: u32,
+
+    #[serde(rename = "fetchResourceEvents", default = "default_true")]
+    pub fetch_resource_events: bool,
+}
+
+fn default_true() -> bool {
+    true
 }
 
 impl Default for SyncConfig {
@@ -61,6 +68,7 @@ impl Default for SyncConfig {
             cursor_rewind_seconds: 2,
             primary_concurrency: 4,
             dependent_concurrency: 2,
+            fetch_resource_events: true,
         }
     }
 }