fix(life_capture): derive embedder dim from model config instead of h…

…ardcode

HostedEmbedder::dim() was hardcoded to 1536 regardless of which model was
configured. Add dim as a constructor parameter so model and vector width
stay in sync. At the bootstrap site, resolve dim from OPENHUMAN_EMBEDDINGS_DIM
(override), known model names (text-embedding-3-large→3072), or default 1536.

Addresses @coderabbitai on src/openhuman/life_capture/embedder.rs:32

src/core/jsonrpc.rs

@@ -943,11 +943,23 @@ async fn bootstrap_life_capture(workspace_dir: &std::path::Path) {
         .unwrap_or_else(|_| "https://api.openai.com/v1".into());
     let model = std::env::var("OPENHUMAN_EMBEDDINGS_MODEL")
         .unwrap_or_else(|_| "text-embedding-3-small".into());
+    // Resolve dim from env so model and dim stay in sync.
+    // text-embedding-3-small / ada-002 → 1536 (default)
+    // text-embedding-3-large            → 3072
+    // Custom models: override via OPENHUMAN_EMBEDDINGS_DIM.
+    let dim: usize = std::env::var("OPENHUMAN_EMBEDDINGS_DIM")
+        .ok()
+        .and_then(|s| s.parse().ok())
+        .unwrap_or_else(|| match model.as_str() {
+            "text-embedding-3-large" => 3072,
+            _ => 1536,
+        });
     let embedder: Arc<dyn crate::openhuman::life_capture::embedder::Embedder> = Arc::new(
         crate::openhuman::life_capture::embedder::HostedEmbedder::new(
             base_url,
             api_key,
             model.clone(),
+            dim,
         ),
     );
     if let Err(e) =

src/openhuman/life_capture/embedder.rs

@@ -13,11 +13,14 @@ pub struct HostedEmbedder {
     base_url: String,
     api_key: String,
     model: String,
+    /// Dimensionality of vectors produced by `model`. Must match the index
+    /// schema; if the model returns a different width `embed_batch` will bail.
+    dim: usize,
     http: reqwest::Client,
 }
 
 impl HostedEmbedder {
-    pub fn new(base_url: String, api_key: String, model: String) -> Self {
+    pub fn new(base_url: String, api_key: String, model: String, dim: usize) -> Self {
         let http = reqwest::Client::builder()
             .timeout(std::time::Duration::from_secs(30))
             .connect_timeout(std::time::Duration::from_secs(10))
@@ -27,6 +30,7 @@ impl HostedEmbedder {
             base_url,
             api_key,
             model,
+            dim,
             http,
         }
     }
@@ -95,7 +99,7 @@ impl Embedder for HostedEmbedder {
     }
 
     fn dim(&self) -> usize {
-        1536
+        self.dim
     }
 }
 
@@ -128,6 +132,7 @@ mod tests {
             format!("{}/v1", server.base_url()),
             "test-key".into(),
             "text-embedding-3-small".into(),
+            1536,
         );
         let out = emb.embed_batch(&["hello", "world"]).await.expect("embed");
         assert_eq!(out.len(), 2);