docs(release): replace TestPyPI publish placeholders with real evidence for v0.3.0

[hiroshitanaka-creator]

Motivation

• The existing docs/release/testpypi_publish_log_v0.3.0.md was a placeholder/template and did not constitute an audit-ready publish evidence document.
• The status snapshot in docs/status.md needed a fact-based entry that records which evidence was fixed and the phase identifier to avoid operator/repo drift.

Description

• Added docs/release/testpypi_publish_log_v0.3.0.md and replaced all placeholders with observed evidence fields including Purpose, Execution time (UTC), Commit SHA (fa10c08) and Release tag (v0.3.0), commands executed, and verbatim observed results.
• Documented that the workflow run URL could not be retrieved from this proxied execution environment and recorded the network restriction (GitHub CONNECT tunnel returned 403) as part of the evidence.
• Updated docs/status.md to add a concrete entry (Phase9-PR-4) that states the TestPyPI publish evidence was fixed and describes what was recorded.
• Kept the evidence factual by removing # expected: style placeholders and replacing them with actual observed outputs from the verification attempts.

Testing

• Ran pytest -q and the test suite completed successfully (3549 passed, 134 skipped).
• Attempted python -m pip install --index-url https://test.pypi.org/simple/ --extra-index-url https://pypi.org/simple po-core-flyingpig==0.3.0 and recorded the observed failure caused by the environment proxy (Tunnel connection failed: 403 Forbidden), so online TestPyPI install evidence could not be captured from this run.
• Performed local import verification with PYTHONPATH=src python -c "import po_core; print(po_core.__version__)" which printed 0.3.0.
• Performed a local runtime smoke with PYTHONPATH=src python -c "from po_core import run; out = run('smoke'); print(out.get('status'))" which printed ok.

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[chatgpt-codex-connector]

Add source path to local smoke import command

After the TestPyPI install step fails, this command cannot run in a fresh checkout because po_core is not on sys.path; running it from the repo root returns ModuleNotFoundError unless PYTHONPATH=src (or an equivalent install step) is provided. That makes the recorded “observed result: 0.3.0” non-reproducible and weakens the release evidence, and the same issue also affects the later run('smoke') command.

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