feat: retire Python embedder + gRPC backend (PR-1.J)

crates/weaver-core/src/embedder.rs

@@ -129,25 +129,6 @@ pub enum EmbeddingError {
     NotAvailable(String),
 }
 
-// gRPC-transport `From` impls. These live here (not in
-// `weaver_spu::encoder::grpc_client_legacy`) because Rust's orphan rule requires foreign-on-
-// foreign impls to be in the trait's crate. The cost is one tonic dep
-// in `weaver-core`; the alternative (explicit `.map_err` at every `?`
-// site in the gRPC client) is a larger maintenance burden than the
-// dep. Removed in PR-3.A along with the gRPC client itself, when the
-// last consumer (`weaver_spu::encoder::grpc_client_legacy`) goes away in PR-3.A.
-impl From<tonic::transport::Error> for EmbeddingError {
-    fn from(e: tonic::transport::Error) -> Self {
-        EmbeddingError::Transport(Box::new(e))
-    }
-}
-
-impl From<tonic::Status> for EmbeddingError {
-    fn from(e: tonic::Status) -> Self {
-        EmbeddingError::Transport(Box::new(e))
-    }
-}
-
 /// Backend-agnostic embedding service.
 ///
 /// Implementations:

crates/weaver-database/Cargo.toml

@@ -29,11 +29,6 @@ tracing.workspace = true
 anyhow.workspace = true
 thiserror.workspace = true
 
-# gRPC / Protobuf
-tonic.workspace = true
-prost.workspace = true
-prost-types.workspace = true
-
 # Encoding
 base64.workspace = true
 urlencoding.workspace = true
@@ -56,9 +51,6 @@ syn.workspace = true
 sha2.workspace = true
 proc-macro2.workspace = true
 
-[build-dependencies]
-tonic-build.workspace = true
-
 [dev-dependencies]
 tempfile.workspace = true
 tokio-stream.workspace = true

crates/weaver-database/src/lib.rs

@@ -4,15 +4,5 @@ pub mod code;
 pub mod config;
 pub mod db;
 pub mod graph;
-// `persephone` (the embedding gRPC client) moved to
-// `weaver-embedding::grpc_client` per
-// `embedder-oxidization-Spec.md` §5.1 (issue #166 / sprint
-// Block A.5). External consumers import from
-// `weaver_spu::encoder::grpc_client_legacy` and `weaver_spu::proto::embedding`.
-// `weaver-database`'s `proto` module continues to generate
-// embedding-service types for backward compat with internal
-// proto-validation tests; a future cleanup PR removes the
-// duplication once all consumers migrate.
-pub mod proto;
 
 pub use config::HadesConfig;