chore: codecov path fix, author name, NWB coverage, docs clarification

[anzalks]

Summary

• Remove relative_files = true (root cause of Codecov 0-files-matched)
• Fix [tool.coverage.paths] source to map from src not src/Synaptipy
• Remove stale rm -f .coverage step from test.yml
• Remove */exporters/nwb_exporter.py from coverage omit (enforce coverage)
• Fix author name: Anzal K Shahul → Anzal K. Shahul
• Clarify graphics engine description in docs/index.rst (CPU-vectorized, not GPU-accelerated)
• Add empirical validation benchmark script and reference CSV

No version bump. No PyPI release triggered.

[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
src/Synaptipy/application
session_manager.py
src/Synaptipy/core/analysis
passive_properties.py					352-356, 759-763
synaptic_events.py
src/Synaptipy/infrastructure/exporters
nwb_exporter.py					338, 343, 345, 347, 351, 359
src/Synaptipy/infrastructure/file_readers
neo_adapter.py					537-538, 540-541
Project Total

This report was generated by python-coverage-comment-action

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 55.26316% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.55%. Comparing base (a93f4bb) to head (207df55).
⚠️ Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Synaptipy/core/analysis/passive_properties.py	28.57%	10 Missing ⚠️
...Synaptipy/infrastructure/exporters/nwb_exporter.py	58.33%	5 Missing ⚠️
...naptipy/infrastructure/file_readers/neo_adapter.py	75.00%	2 Missing ⚠️

❌ Your patch status has failed because the patch coverage (55.26%) is below the target coverage (90.00%). You can increase the patch coverage or adjust the target coverage.
❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff            @@
##           main      #27       +/-   ##
=========================================
+ Coverage      0   91.55%   +91.55%     
=========================================
  Files         0       55       +55     
  Lines         0     7826     +7826     
=========================================
+ Hits          0     7165     +7165     
- Misses        0      661      +661     

Flag	Coverage Δ
unittests	91.55% <55.26%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/Synaptipy/application/session_manager.py	100.00% <100.00%> (ø)
src/Synaptipy/core/analysis/synaptic_events.py	95.76% <100.00%> (ø)
src/Synaptipy/templates/plugin_template.py	100.00% <ø> (ø)
...naptipy/infrastructure/file_readers/neo_adapter.py	87.55% <75.00%> (ø)
...Synaptipy/infrastructure/exporters/nwb_exporter.py	48.19% <58.33%> (ø)
src/Synaptipy/core/analysis/passive_properties.py	96.70% <28.57%> (ø)

... and 49 files with indirect coverage changes

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