[PR] fix: support module-level @runnable with continue_tracing() [skywalking-python]

["wu-sheng (via GitHub)" <gi...@apache.org>]

wu-sheng opened a new pull request, #391:
URL: https://github.com/apache/skywalking-python/pull/391

   ## Summary
   
   - `@runnable` now returns a `_RunnableWrapper` object with a `continue_tracing()` method
   - `continue_tracing()` captures the snapshot on the calling (parent) thread and returns a callable for use as `Thread` target
   - Direct calls to a `@runnable`-decorated function still work as a local span (same as `@trace`)
   - No global monkey-patching of `threading.Thread`
   
   **Before (broken for module-level):**
   ```python
   @runnable(op='/post')
   def post():
       requests.post(...)
   
   thread = Thread(target=post)  # snapshot was captured at import time — None
   thread.start()
   ```
   
   **After:**
   ```python
   @runnable(op='/post')
   def post():
       requests.post(...)
   
   thread = Thread(target=post.continue_tracing())  # snapshot captured here
   thread.start()
   ```
   
   Closes https://github.com/apache/skywalking/issues/11605
   
   ## Test plan
   
   - [x] New test `tests/plugin/web/sw_threading/` — module-level `@runnable` with `continue_tracing()`, validates CrossThread ref
   - [ ] Existing Flask test (`tests/plugin/web/sw_flask/`) — uses inline `@runnable`, backward compatible via direct `__call__`
   - [ ] CI full matrix validation
   
   🤖 Generated with [Claude Code](https://claude.com/claude-code)


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Re: [PR] fix: support module-level @runnable with continue_tracing() [skywalking-python]

["wu-sheng (via GitHub)" <gi...@apache.org>]

wu-sheng merged PR #391:
URL: https://github.com/apache/skywalking-python/pull/391


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