Wire `reg_addr` into `test_context_stream_semantics`

Same wire-up pattern as the prior `test_dynamic_pub_sub`
commit: each test that already pulled in `debug_mode`
now also pulls in `reg_addr` and passes
`registry_addrs=[reg_addr]` into `tractor.open_nursery()`,
so the suite's standard registry-addr conventions apply.

Tests touched:
- `test_started_misuse`
- `test_simple_context`
- `test_parent_cancels`
- `test_one_end_stream_not_opened`
- `test_maybe_allow_overruns_stream`
- `test_ctx_with_self_actor`

(this commit msg was generated in some part by [`claude-code`][claude-code-gh])
[claude-code-gh]: https://github.com/anthropics/claude-code

tests/test_context_stream_semantics.py

@@ -115,10 +115,12 @@ async def not_started_but_stream_opened(
 )
 def test_started_misuse(
     target: Callable,
+    reg_addr: tuple,
     debug_mode: bool,
 ):
     async def main():
         async with tractor.open_nursery(
+            registry_addrs=[reg_addr],
             debug_mode=debug_mode,
         ) as an:
             portal = await an.start_actor(
@@ -184,6 +186,7 @@ def test_simple_context(
     error_parent,
     child_blocks_forever,
     pointlessly_open_stream,
+    reg_addr: tuple,
     debug_mode: bool,
 ):
 
@@ -193,6 +196,7 @@ def test_simple_context(
 
         with trio.fail_after(timeout):
             async with tractor.open_nursery(
+                registry_addrs=[reg_addr],
                 debug_mode=debug_mode,
             ) as an:
                 portal = await an.start_actor(
@@ -278,6 +282,7 @@ def test_parent_cancels(
     cancel_method: str,
     chk_ctx_result_before_exit: bool,
     child_returns_early: bool,
+    reg_addr: tuple,
     debug_mode: bool,
 ):
     '''
@@ -355,6 +360,7 @@ def test_parent_cancels(
     async def main():
 
         async with tractor.open_nursery(
+            registry_addrs=[reg_addr],
             debug_mode=debug_mode,
         ) as an:
             portal = await an.start_actor(
@@ -931,6 +937,7 @@ async def keep_sending_from_child(
 )
 def test_one_end_stream_not_opened(
     overrun_by: tuple[str, int, Callable],
+    reg_addr: tuple,
     debug_mode: bool,
 ):
     '''
@@ -949,6 +956,7 @@ def test_one_end_stream_not_opened(
 
     async def main():
         async with tractor.open_nursery(
+            registry_addrs=[reg_addr],
             debug_mode=debug_mode,
         ) as an:
             portal = await an.start_actor(
@@ -1113,6 +1121,7 @@ def test_maybe_allow_overruns_stream(
 
     # conftest wide
     loglevel: str,
+    reg_addr: tuple,
     debug_mode: bool,
 ):
     '''
@@ -1133,6 +1142,7 @@ def test_maybe_allow_overruns_stream(
     '''
     async def main():
         async with tractor.open_nursery(
+            registry_addrs=[reg_addr],
             debug_mode=debug_mode,
         ) as an:
             portal = await an.start_actor(
@@ -1249,6 +1259,7 @@ def test_maybe_allow_overruns_stream(
 
 def test_ctx_with_self_actor(
     loglevel: str,
+    reg_addr: tuple,
     debug_mode: bool,
 ):
     '''
@@ -1263,6 +1274,7 @@ def test_ctx_with_self_actor(
     '''
     async def main():
         async with tractor.open_nursery(
+            registry_addrs=[reg_addr],
             debug_mode=debug_mode,
             enable_modules=[__name__],
         ) as an: