feat(directives): harvest 7 directives from python.md §17.1-17.7 (banned patterns + boundary exception)

conductor/directives/ban_hasattr_dispatch/v1.md

@@ -0,0 +1,36 @@
+# ban_hasattr_dispatch — v1
+
+**Why this iteration:** Lifted verbatim from `conductor/code_styleguides/python.md` §17.4 (lines 300-326).
+This is the baseline encoding — the imperative-ban style currently in production.
+Future variants will test alternative encodings (rationale-first, before/after, tabular) against this baseline.
+
+**Source:** `conductor/code_styleguides/python.md:300-326`
+
+---
+
+### 17.4 Banned: `hasattr()` for entity type dispatch
+
+```python
+# BANNED:
+def handle_event(self, event: Metadata) -> None:
+ if hasattr(event, 'tool_calls'):
+  # tool call path
+ elif hasattr(event, 'source_tier'):
+  # mma path
+ elif hasattr(event, 'path'):
+  # file path
+
+# CORRECT (typed Union dispatch):
+def handle_event(self, event: CommsLogEntry | FileItem | HistoryMessage) -> None:
+ if isinstance(event, CommsLogEntry):
+  # mma path
+ elif isinstance(event, FileItem):
+  # file path
+ elif isinstance(event, HistoryMessage):
+  # tool call path
+
+# CORRECT (preferred — refactor so no dispatch is needed):
+def _handle_comms_entry(self, event: CommsLogEntry) -> None: ...
+def _handle_file_item(self, event: FileItem) -> None: ...
+def _handle_history(self, event: HistoryMessage) -> None: ...
+```