[codex] Prepare 0.7.0 bugfix release

[ZenulAbidin]

Summary

• prepare the 0.7.0 bugfix release
• harden mocked provider tests and fee-estimator fallbacks
• update packaging metadata and Python support for the new release
• keep CI on Node 24-safe GitHub Actions versions

Validation

• python -m build
• python -m twine check dist/*
• python -m tox
• verified release artifacts contain no pycache or .pyc entries

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.70%. Comparing base (d1c6f08) to head (f6744a5).
⚠️ Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
zpywallet/fees/btc/loadbalancer.py	0.00%	1 Missing and 1 partial ⚠️
zpywallet/fees/doge/loadbalancer.py	50.00%	1 Missing and 1 partial ⚠️
zpywallet/fees/eth/loadbalancer.py	0.00%	2 Missing ⚠️
zpywallet/fees/btc/blockcypher.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #18      +/-   ##
==========================================
+ Coverage   66.39%   66.70%   +0.31%     
==========================================
  Files         135      135              
  Lines        5008     5010       +2     
  Branches      754      635     -119     
==========================================
+ Hits         3325     3342      +17     
- Misses       1425     1430       +5     
+ Partials      258      238      -20     

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Initialize server before calling mock-start helper

_start_mock_server(...) can raise RuntimeError (for example when the chosen port is grabbed between selection and bind), and in that case this assignment never completes, so the finally: server.terminate() path raises UnboundLocalError and masks the real failure. This makes intermittent CI startup issues much harder to diagnose and affects all three tests that use this try/finally pattern with _start_mock_server.

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