feat(pyproject): pin decnet-behave-{core,shell} >=0.1.0,<0.2

Lock the BEHAVE library versions per BEHAVE-INTEGRATION.md
§Versioning. The profiler worker (Phase 4 wiring) imports
`Observation`/`Window` from `decnet_behave_core.spec.envelope` and
`event_topic_for`/`to_event_payload` from
`decnet_behave_shell.spec.event_adapter`; without the pin a broken
wheel or missing install would only show up on first publish.

Four-test smoke pins the public surface: envelope construction,
registry import non-empty, event-adapter topic shape, and the
adapter's id/ts/v exclusion contract.

pyproject.toml

@@ -47,6 +47,12 @@ dependencies = [
     # platform-marker keeps macOS/Windows installs from pulling a
     # never-imported wheel.
     "asyncinotify>=4.0 ; sys_platform == 'linux'",
+    # BEHAVE — out-of-tree behavioural-observation framework. core ships
+    # the Observation envelope; shell ships the primitive registry +
+    # bus event adapter consumed by decnet/profiler/behave_shell/. Pin
+    # range tracks BEHAVE-INTEGRATION.md §"Versioning".
+    "decnet-behave-core>=0.1.0,<0.2",
+    "decnet-behave-shell>=0.1.0,<0.2",
 ]
 
 [project.optional-dependencies]