fix(orchestrator): add switch_project/clear_history/recent_history delegators

`src/main.rs` invokes three Orchestrator methods that did not exist on
the type, causing `cargo check --bin mobile-ai` to fail with 4 E0599
errors (two for `switch_project`, one each for `clear_history` and
`recent_history`). The methods all exist on the inner ContextManager
already, so the fix is three pure-delegation forwarders.

Imports `ConversationTurn` from `crate::types` (already declared in
that module) to match the return-type shape of `recent_history`.

Restores library + binary build. Existing tests unaffected (39 lib
tests still pass; two unrelated SNN tests — `snn::tests::test_lif_neuron_reset`
and `snn::tests::test_spiking_network_reset` — fail on main and are
out of scope here).

Surfaced 2026-05-27 during the Track E Cargo CVE phantom-strip pilot
in PR #41 — the build break was visible but unrelated to the CVE work.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

src/orchestrator.rs

@@ -18,7 +18,7 @@ use crate::{
     context::ContextManager,
     expert::ExpertSystem,
     router::{Router, RouterConfig},
-    types::{Query, Response, ResponseMetadata, RoutingDecision},
+    types::{ConversationTurn, Query, Response, ResponseMetadata, RoutingDecision},
 };
 
 /// Orchestrator: Coordinates the full AI pipeline.
@@ -82,6 +82,21 @@ impl Orchestrator {
 
         Ok(response)
     }
+
+    /// Set the active project on the underlying ContextManager.
+    pub fn switch_project(&mut self, project: impl Into<String>) {
+        self.context.switch_project(project);
+    }
+
+    /// Drop the active project's conversation history.
+    pub fn clear_history(&mut self) {
+        self.context.clear_history();
+    }
+
+    /// Borrow the N most recent turns from the active project's history.
+    pub fn recent_history(&self, n: usize) -> Vec<ConversationTurn> {
+        self.context.recent_history(n)
+    }
 }
 
 impl Default for Orchestrator {