Include package name in the identifier of decorated task

[superstar54]

Add SocketAnnotated for annotated Python types without an explicit mapping.

When a task input/output is annotated with a Python type, the socket identifier is resolved from the type mapping. If the type is not mapped, the socket falls back to node_graph.annotated and records the Python type in metadata. If no annotation, fall back to SocketAny.

[codecov]

Codecov Report

❌ Patch coverage is 92.63158% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.46%. Comparing base (4226b08) to head (b0e5911).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/node_graph/socket_spec.py	91.66%	4 Missing ⚠️
tests/test_link.py	86.36%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             main     #139    +/-   ##
========================================
  Coverage   90.45%   90.46%            
========================================
  Files          79       79            
  Lines        8134     8236   +102     
========================================
+ Hits         7358     7451    +93     
- Misses        776      785     +9     

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