feat(related): add semantic similarity discovery command

Implement `lore related` command for discovering semantically similar entities
using vector embeddings. Supports two modes:

Entity mode:
  lore related issues 42     # Find entities similar to issue #42
  lore related mrs 99        # Find entities similar to MR !99

Query mode:
  lore related "auth bug"    # Find entities matching free text query

Key features:
- Uses existing embedding infrastructure (nomic-embed-text via Ollama)
- Computes shared labels between source and results
- Shows similarity scores as percentage (0-100%)
- Warns when all results have low similarity (<30%)
- Warns for short queries (<=2 words) that may produce noisy results
- Filters out discussion/note documents, returning only issues and MRs
- Handles orphaned documents gracefully (skips if entity deleted)
- Robot mode JSON output with {ok, data, meta} envelope

Implementation details:
- distance_to_similarity() converts L2 distance to 0-1 score: 1/(1+distance)
- Uses saturating_add/saturating_mul for overflow safety on limit parameter
- Proper error handling for missing embeddings ("run lore embed first")
- Project scoping via -p flag with fuzzy matching

CLI integration:
- Added to autocorrect.rs command registry
- Added Related variant to Commands enum in cli/mod.rs
- Wired into main.rs with handle_related()

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

src/main.rs

@@ -18,15 +18,16 @@ use lore::cli::commands::{
     print_event_count, print_event_count_json, print_file_history, print_file_history_json,
     print_generate_docs, print_generate_docs_json, print_ingest_summary, print_ingest_summary_json,
     print_list_issues, print_list_issues_json, print_list_mrs, print_list_mrs_json,
-    print_list_notes, print_list_notes_json, print_search_results, print_search_results_json,
-    print_show_issue, print_show_issue_json, print_show_mr, print_show_mr_json, print_stats,
-    print_stats_json, print_sync, print_sync_json, print_sync_status, print_sync_status_json,
-    print_timeline, print_timeline_json_with_meta, print_trace, print_trace_json, print_who_human,
-    print_who_json, query_notes, run_auth_test, run_count, run_count_events, run_cron_install,
-    run_cron_status, run_cron_uninstall, run_doctor, run_drift, run_embed, run_file_history,
-    run_generate_docs, run_ingest, run_ingest_dry_run, run_init, run_list_issues, run_list_mrs,
-    run_me, run_search, run_show_issue, run_show_mr, run_stats, run_sync, run_sync_status,
-    run_timeline, run_token_set, run_token_show, run_who,
+    print_list_notes, print_list_notes_json, print_related_human, print_related_json,
+    print_search_results, print_search_results_json, print_show_issue, print_show_issue_json,
+    print_show_mr, print_show_mr_json, print_stats, print_stats_json, print_sync, print_sync_json,
+    print_sync_status, print_sync_status_json, print_timeline, print_timeline_json_with_meta,
+    print_trace, print_trace_json, print_who_human, print_who_json, query_notes, run_auth_test,
+    run_count, run_count_events, run_cron_install, run_cron_status, run_cron_uninstall, run_doctor,
+    run_drift, run_embed, run_file_history, run_generate_docs, run_ingest, run_ingest_dry_run,
+    run_init, run_list_issues, run_list_mrs, run_me, run_related, run_search, run_show_issue,
+    run_show_mr, run_stats, run_sync, run_sync_status, run_timeline, run_token_set, run_token_show,
+    run_who,
 };
 use lore::cli::render::{ColorMode, GlyphMode, Icons, LoreRenderer, Theme};
 use lore::cli::robot::{RobotMeta, strip_schemas};
@@ -225,6 +226,22 @@ async fn main() {
             )
             .await
         }
+        Some(Commands::Related {
+            query_or_type,
+            iid,
+            limit,
+            project,
+        }) => {
+            handle_related(
+                cli.config.as_deref(),
+                &query_or_type,
+                iid,
+                limit,
+                project.as_deref(),
+                robot_mode,
+            )
+            .await
+        }
         Some(Commands::Stats(args)) => handle_stats(cli.config.as_deref(), args, robot_mode).await,
         Some(Commands::Embed(args)) => handle_embed(cli.config.as_deref(), args, robot_mode).await,
         Some(Commands::Sync(args)) => {
@@ -1996,7 +2013,7 @@ async fn handle_timeline(
     if robot_mode {
         print_timeline_json_with_meta(
             &result,
-            result.total_events_before_limit,
+            result.total_filtered_events,
             params.depth,
             !params.no_mentions,
             args.fields.as_deref(),
@@ -3256,6 +3273,28 @@ async fn handle_drift(
     Ok(())
 }
 
+async fn handle_related(
+    config_override: Option<&str>,
+    query_or_type: &str,
+    iid: Option<i64>,
+    limit: usize,
+    project: Option<&str>,
+    robot_mode: bool,
+) -> Result<(), Box<dyn std::error::Error>> {
+    let start = std::time::Instant::now();
+    let config = Config::load(config_override)?;
+    let effective_project = config.effective_project(project);
+    let response = run_related(&config, query_or_type, iid, limit, effective_project).await?;
+    let elapsed_ms = start.elapsed().as_millis() as u64;
+
+    if robot_mode {
+        print_related_json(&response, elapsed_ms);
+    } else {
+        print_related_human(&response);
+    }
+    Ok(())
+}
+
 #[allow(clippy::too_many_arguments)]
 async fn handle_list_compat(
     config_override: Option<&str>,