docs: Update README and AGENTS.md with new features and options

README.md:
- Add cross-reference tracking feature description
- Add resource event history feature description
- Add observability feature description (verbosity, JSON logs, metrics)
- Document --no-events flag for sync command
- Add sync timing/progress bar behavior note
- Document verbosity flags (-v, -vv, -vvv)
- Document --log-format json option
- Add new database tables to schema reference:
  - resource_state_events
  - resource_label_events
  - resource_milestone_events
  - entity_references

AGENTS.md:
- Add --no-events example for sync command
- Document verbosity flags (-v, -vv, -vvv)
- Document --log-format json option

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

README.md

@@ -12,7 +12,10 @@ Local GitLab data management with semantic search. Syncs issues, MRs, discussion
 - **Hybrid search**: Combines FTS5 lexical search with Ollama-powered vector embeddings via Reciprocal Rank Fusion
 - **Raw payload storage**: Preserves original GitLab API responses for debugging
 - **Discussion threading**: Full support for issue and MR discussions including inline code review comments
+- **Cross-reference tracking**: Automatic extraction of "closes", "mentioned" relationships between MRs and issues
+- **Resource event history**: Tracks state changes, label events, and milestone events for issues and MRs
 - **Robot mode**: Machine-readable JSON output with structured errors and meaningful exit codes
+- **Observability**: Verbosity controls, JSON log format, structured metrics, and stage timing
 
 ## Installation
 
@@ -254,8 +257,11 @@ lore sync --full             # Reset cursors, fetch everything
 lore sync --force            # Override stale lock
 lore sync --no-embed         # Skip embedding step
 lore sync --no-docs          # Skip document regeneration
+lore sync --no-events        # Skip resource event fetching
 ```
 
+The sync command displays animated progress bars for each stage and outputs timing metrics on completion. In robot mode (`-J`), detailed stage timing is included in the JSON response.
+
 ### `lore ingest`
 
 Sync data from GitLab to local database. Runs only the ingestion step (no doc generation or embeddings).
@@ -478,6 +484,10 @@ lore -J <command>                         # JSON shorthand
 lore --color never <command>              # Disable color output
 lore --color always <command>             # Force color output
 lore -q <command>                         # Suppress non-essential output
+lore -v <command>                         # Debug logging
+lore -vv <command>                        # More verbose debug logging
+lore -vvv <command>                       # Trace-level logging
+lore --log-format json <command>          # JSON-formatted log output to stderr
 ```
 
 Color output respects `NO_COLOR` and `CLICOLOR` environment variables in `auto` mode (the default).
@@ -518,6 +528,10 @@ Data is stored in SQLite with WAL mode and foreign keys enabled. Main tables:
 | `mr_reviewers` | Many-to-many MR-reviewer relationships |
 | `discussions` | Issue/MR discussion threads |
 | `notes` | Individual notes within discussions (with system note flag and DiffNote position data) |
+| `resource_state_events` | Issue/MR state change history (opened, closed, merged, reopened) |
+| `resource_label_events` | Label add/remove events with actor and timestamp |
+| `resource_milestone_events` | Milestone add/remove events with actor and timestamp |
+| `entity_references` | Cross-references between entities (MR closes issue, mentioned in, etc.) |
 | `documents` | Extracted searchable text for FTS and embedding |
 | `documents_fts` | FTS5 full-text search index |
 | `embeddings` | Vector embeddings for semantic search |