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/cli/commands/sync.rs

@@ -19,6 +19,7 @@ pub struct SyncOptions {
     pub force: bool,
     pub no_embed: bool,
     pub no_docs: bool,
+    pub no_events: bool,
     pub robot_mode: bool,
 }