proto becomes bxcore, the one shared crate (M5b task 00)

Done the way the owner asked and the spike mapped: the crate and the
manifests renamed, then what the build reported fixed. Layers: 138
"proto unresolved" errors across 169 files; cargo fmt reordering
imports; six fixture paths built as strings in brokerd's and bxctl's
tests, which the compiler cannot see, and comments naming
crates/proto/; the crate-dependency check and its self-test. One more
the spike did not reach: a `\nproto =` key inside a printf format in
the self-test, which a word-boundary replacement skips because `n` and
`p` are both word characters.

make gate: gate: ok, 944 tests; no new entry in /tmp.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

crates/loopd/src/turn.rs

@@ -8,7 +8,9 @@ use crate::llama::info::{CacheOutcome, cache_outcome};
 use crate::llama::{ChatEvent, ChatRequest, Client, InferError};
 use crate::session::{Session, SessionError};
 use crate::tools::{Registry, ToolPort, cap_result, denial_text, dispatch};
-use proto::{CallId, DataClass, LogRecord, Timestamp, ToolRequest, ToolResponse, TurnEvent, Usage};
+use bxcore::{
+    CallId, DataClass, LogRecord, Timestamp, ToolRequest, ToolResponse, TurnEvent, Usage,
+};
 
 /// What one turn can fail with, beyond the inference server.
 #[derive(Debug)]
@@ -258,7 +260,7 @@ pub fn run_turn(
 fn run_call(
     rt: &Runtime<'_>,
     session: &Session,
-    call: &proto::ToolCall,
+    call: &bxcore::ToolCall,
     call_id: CallId,
     on_event: &mut dyn FnMut(&TurnEvent),
 ) -> (String, DataClass, bool) {