fix: document upsert project_id, truncation budget, and Ollama model matching

- regenerator: Include project_id in the ON CONFLICT UPDATE clause for
  document upserts. Previously, if a document moved between projects
  (e.g., during re-ingestion), the project_id would remain stale.

- truncation: Compute the omission marker ("N notes omitted") before
  checking whether first+last notes fit in the budget. The old order
  computed the marker after the budget check, meaning the marker's byte
  cost was unaccounted for and could cause over-budget output.

- ollama: Tighten model name matching to require either an exact match
  or a colon-delimited tag prefix (model == name or name starts with
  "model:"). The prior starts_with check would false-positive on
  "nomic-embed-text-v2" when looking for "nomic-embed-text". Tests
  updated to cover exact match, tagged, wrong model, and prefix
  false-positive cases.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/embedding/ollama.rs

@@ -87,10 +87,9 @@ impl OllamaClient {
                     source: Some(e),
                 })?;
 
-        let model_found = tags
-            .models
-            .iter()
-            .any(|m| m.name.starts_with(&self.config.model));
+        let model_found = tags.models.iter().any(|m| {
+            m.name == self.config.model || m.name.starts_with(&format!("{}:", self.config.model))
+        });
 
         if !model_found {
             return Err(LoreError::OllamaModelNotFound {
@@ -169,13 +168,32 @@ mod tests {
     }
 
     #[test]
-    fn test_health_check_model_starts_with() {
+    fn test_health_check_model_matching() {
         let model = "nomic-embed-text";
-        let tag_name = "nomic-embed-text:latest";
-        assert!(tag_name.starts_with(model));
 
-        let wrong_model = "llama2";
-        assert!(!tag_name.starts_with(wrong_model));
+        let tag_name = "nomic-embed-text:latest";
+        assert!(
+            tag_name == model || tag_name.starts_with(&format!("{model}:")),
+            "should match model with tag"
+        );
+
+        let exact_name = "nomic-embed-text";
+        assert!(
+            exact_name == model || exact_name.starts_with(&format!("{model}:")),
+            "should match exact model name"
+        );
+
+        let wrong_model = "llama2:latest";
+        assert!(
+            !(wrong_model == model || wrong_model.starts_with(&format!("{model}:"))),
+            "should not match wrong model"
+        );
+
+        let similar_model = "nomic-embed-text-v2:latest";
+        assert!(
+            !(similar_model == model || similar_model.starts_with(&format!("{model}:"))),
+            "should not false-positive on model name prefix"
+        );
     }
 
     #[test]