[pitboss] phase 03: Track A.3 — LangEmitter::entry_kinds_supported + actionable Inconclusive hints

src/dynamic/lang/python.rs

@@ -13,10 +13,35 @@
 //! - `PayloadSlot::EnvVar(name)` — set env var before calling.
 //! - Other slots produce `UnsupportedReason::EntryKindUnsupported`.
 
-use crate::dynamic::lang::HarnessSource;
-use crate::dynamic::spec::{HarnessSpec, PayloadSlot};
+use crate::dynamic::lang::{HarnessSource, LangEmitter};
+use crate::dynamic::spec::{EntryKind, HarnessSpec, PayloadSlot};
 use crate::evidence::UnsupportedReason;
 
+/// Zero-sized [`LangEmitter`] handle for Python.  Registered in the
+/// `lang::dispatch` table; method bodies delegate to the existing free
+/// functions in this module.
+pub struct PythonEmitter;
+
+/// Entry kinds the Python emitter currently understands.  Extended in Phase 12
+/// (Track B Python vertical) to include `HttpRoute`, `CliSubcommand`, etc.
+const SUPPORTED: &[EntryKind] = &[EntryKind::Function];
+
+impl LangEmitter for PythonEmitter {
+    fn emit(&self, spec: &HarnessSpec) -> Result<HarnessSource, UnsupportedReason> {
+        emit(spec)
+    }
+
+    fn entry_kinds_supported(&self) -> &'static [EntryKind] {
+        SUPPORTED
+    }
+
+    fn entry_kind_hint(&self, attempted: EntryKind) -> String {
+        format!(
+            "python emitter supports {SUPPORTED:?}; this finding's enclosing context is `EntryKind::{attempted}` — Track B will add framework + CLI shapes in phase 12"
+        )
+    }
+}
+
 /// Emit a Python harness for `spec`.
 pub fn emit(spec: &HarnessSpec) -> Result<HarnessSource, UnsupportedReason> {
     // Validate payload slot.
@@ -237,6 +262,21 @@ mod tests {
         assert_eq!(module_name("no_ext"), "no_ext");
     }
 
+    #[test]
+    fn entry_kinds_supported_is_non_empty() {
+        assert!(!PythonEmitter.entry_kinds_supported().is_empty());
+        assert!(PythonEmitter
+            .entry_kinds_supported()
+            .contains(&EntryKind::Function));
+    }
+
+    #[test]
+    fn entry_kind_hint_names_attempted_and_phase() {
+        let hint = PythonEmitter.entry_kind_hint(EntryKind::HttpRoute);
+        assert!(hint.contains("HttpRoute"));
+        assert!(hint.contains("phase 12"));
+    }
+
     #[test]
     fn unsupported_lang_returns_err() {
         let mut spec = make_spec(PayloadSlot::Param(0));