[FBumann]

Prompt: Prepare a release!

Prompt: Include the brwoser stack! It will land on main shortly

Note

The following content was generated by AI.

## Upcoming version becomes ## 0.9.0 (2026-10-12), edited into release notes. It is a minor release because #1980 breaks code: solve_over(carry=) and archive.carry are gone. The browser stack (#1973, #1975, #1988, #1991) is on main, and this branch has main merged in, so the diff is CHANGELOG.md alone.

What the notes say, and how each claim was checked

• specsolve runs in the browser. feat(deps): specsolve runs on polars 1.33.1, the newest polars that runs in the browser #1973 lowers the polars floor to 1.33.1. ci: every pull request installs, solves and sweeps a wheel of specsolve in Pyodide, the browser's Python #1975 runs a wheel in Pyodide 314.0.7 in CI. fix(api): a call that reads or writes parquet is refused by name where polars has no parquet, as in the browser #1988 refuses a file by name where polars has no parquet. feat(api): a run in the browser reads and writes its files through pyarrow, where polars has no parquet #1991 reads and writes files through pyarrow. In Pyodide, a sweep archived to a zip read back natively, with primal equal to a native solve's (feat(api): a run in the browser reads and writes its files through pyarrow, where polars has no parquet #1991).
• Model files and archives from 0.8.x work as before. No layout number moved since 0.8.1. refactor(api): the carry is an argument of the axis rather than of solve_over, so an archive's axis holds its carry #1980 checked that axis.json is byte-identical to what 0.8.1 writes, so an 0.8.x archive's axis reads back with its carry.
• Breaks: solve_over(carry=) moves onto the axis; archive.carry and inputs.carry become archive.axis.carry; a hand-built list carries nothing (refactor(api): the carry is an argument of the axis rather than of solve_over, so an archive's axis holds its carry #1980).
• Five tutorials: docs(tutorials): the first tutorial walks a new user through the model, its data and its answer #1955 to docs(tutorials): the last tutorial adds a battery, and solves the model per scenario and window by window #1959. docs: the last tutorial solves a horizon too large for one solve, and shows what windows cost #1984 rewrites the last one.

Lines, and the gate

• All 30 lines under Upcoming version on main at 9394b75 are in the section, word for word, and no other line is. They are grouped under The browser, Sweeps, Tutorials and The site. ci: every pull request installs, solves and sweeps a wheel of specsolve in Pyodide, the browser's Python #1975 is ci and adds none.
• The merge of main conflicted only in CHANGELOG.md, and this branch's section was kept.
• python -m tools.changelog check: releases 0.9.0 on merge. python -m tools.changelog notes 0.9.0 prints the section.

🤖 Generated with Claude Code

https://claude.ai/code/session_01G1TmcQZZCctsVr54HE93qS

[read-the-docs-community]

Documentation build overview

📚 specsolve | 🛠️ Build #35088193 | 📁 Comparing 2d42f26 against latest (e70eee4)

  🔍 Preview build  

3 files changed

± about/changelog/index.html
± development/architecture/index.html
± reference/api/index.html

[codspeed]

Merging this PR will not alter performance

✅ 93 untouched benchmarks
⏩ 307 skipped benchmarks¹

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_{Comparing chore/release-0.9.0 (2d42f26) with main (c210067)²}

Footnotes

1. 307 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

2. No successful run was found on main (9394b75) during the generation of this report, so c210067 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩