release: ship ExcelAlchemy 2.0.0

[ruicore]

Summary

This PR promotes the v2 branch to the first stable public release of ExcelAlchemy 2.0.

What changed

• bump the package version from 2.0.0rc1 to 2.0.0
• finalize stable-release wording across README, README_cn, migrations, and changelog
• add a dedicated docs/releases/2.0.0.md release checklist
• finalize the CI + Codecov upload path
• remove the public author email from package metadata
• sanitize fixture contact data to avoid ambiguous personal-looking information

Verification

• ./.venv/bin/ruff check .
• ./.venv/bin/uv run pyright
• ./.venv/bin/pytest -q

[codecov]

Codecov Report

❌ Patch coverage is 85.72961% with 399 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.04%. Comparing base (527b51c) to head (e00b246).
⚠️ Report is 31 commits behind head on main.

Files with missing lines	Patch %	Lines
src/excelalchemy/metadata.py	74.41%	37 Missing and 39 partials ⚠️
src/excelalchemy/core/alchemy.py	83.39%	33 Missing and 15 partials ⚠️
src/excelalchemy/helper/pydantic.py	79.13%	21 Missing and 8 partials ⚠️
src/excelalchemy/codecs/number_range.py	73.26%	16 Missing and 11 partials ⚠️
src/excelalchemy/codecs/date_range.py	81.81%	14 Missing and 10 partials ⚠️
src/excelalchemy/codecs/number.py	79.16%	13 Missing and 7 partials ⚠️
src/excelalchemy/core/rows.py	78.26%	14 Missing and 6 partials ⚠️
src/excelalchemy/config.py	78.16%	9 Missing and 10 partials ⚠️
src/excelalchemy/core/executor.py	74.62%	9 Missing and 8 partials ⚠️
src/excelalchemy/core/table.py	86.00%	9 Missing and 5 partials ⚠️
... and 21 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
- Coverage   90.76%   86.04%   -4.73%     
==========================================
  Files          31       46      +15     
  Lines        2188     2931     +743     
  Branches        0      366     +366     
==========================================
+ Hits         1986     2522     +536     
- Misses        202      242      +40     
- Partials        0      167     +167     

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Preserve requiredness for Optional fields without defaults

PydanticFieldAdapter.required currently falls back to return not self.allows_none, which marks field: T | None as optional even when no default is provided. In Pydantic v2, T | None without a default is still required (the key must be present), so this misclassification causes template/header validation to treat required columns as optional and defers failures to per-row validation at import time. This regresses required-column detection for common model declarations like address: String | None = FieldMeta(...).

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