feat(cli): add 'lore related' semantic similarity command (bd-8con)

Adds 'lore related' / 'lore similar' command for discovering semantically
related issues and MRs using vector embeddings.

Two modes:
- Entity mode: find entities similar to a specific issue/MR
- Query mode: embed free text and find matching entities

Includes distance-to-similarity conversion, label intersection,
human and robot output formatters, and 11 unit tests.

src/cli/commands/mod.rs

@@ -8,11 +8,13 @@ pub mod generate_docs;
 pub mod ingest;
 pub mod init;
 pub mod list;
+pub mod related;
 pub mod search;
 pub mod show;
 pub mod stats;
 pub mod sync;
 pub mod sync_status;
+pub mod sync_surgical;
 pub mod timeline;
 pub mod trace;
 pub mod tui;
@@ -39,6 +41,7 @@ pub use list::{
     print_list_notes, print_list_notes_csv, print_list_notes_json, print_list_notes_jsonl,
     query_issues, query_mrs, query_notes, run_list_issues, run_list_mrs,
 };
+pub use related::{print_related, print_related_json, run_related};
 pub use search::{
     SearchCliFilters, SearchResponse, print_search_results, print_search_results_json, run_search,
 };
@@ -49,6 +52,7 @@ pub use show::{
 pub use stats::{print_stats, print_stats_json, run_stats};
 pub use sync::{SyncOptions, SyncResult, print_sync, print_sync_json, run_sync};
 pub use sync_status::{print_sync_status, print_sync_status_json, run_sync_status};
+pub use sync_surgical::run_sync_surgical;
 pub use timeline::{TimelineParams, print_timeline, print_timeline_json_with_meta, run_timeline};
 pub use trace::{parse_trace_path, print_trace, print_trace_json};
 pub use tui::{TuiArgs, find_lore_tui, run_tui};