release: v0.1.0 as pyopenquant on PyPI (#58)

[Sean-Koval]

Prepares the first release. Closes #58.

Changes

• Distribution name: pyopenquant on PyPI (the decision for Choose a distribution name and make package metadata and README accurate #58). It was already the value of [project] name; the "placeholder" comment is replaced by a record of the decision. The import name stays openquant, and the warning not to pip install openquant (an unrelated project) stays.
• Docs: README, the Overview, Quickstart and Python-bindings pages, and docs/publishing.md drop the "not decided yet" wording and say releases are published as pyopenquant (from v0.1.0, pip install pyopenquant). last_authored is bumped on the three edited site pages.
• CHANGELOG.md: ## Unreleased becomes ## 0.1.0 - 2026-10-01 (with a fresh empty ## Unreleased above it), the intro paragraph no longer says nothing is published, and the changelog site page is regenerated.

Checked locally: release_info.py metadata --tag v0.1.0 (name pyopenquant, version 0.1.0 everywhere, toolchain 1.98.1), release_info.py notes 0.1.0, generate_site_pages.py --check, and uv lock --check (no lock change needed: the name was already pyopenquant).

Before tagging (maintainer, one-time; see docs/publishing.md)

• PyPI pending trusted publisher: project pyopenquant, owner Open-Quant, repository openquant, workflow release.yml, environment pypi
• GitHub environment pypi (recommended: only v* tags, required reviewer)
• Repository secret CARGO_REGISTRY_TOKEN (crates.io token scoped to openquant, publish-new + publish-update)

After this merges

git checkout main && git pull
git tag -a v0.1.0 -m "OpenQuant 0.1.0"
git push origin v0.1.0

The tag runs release.yml: builds and smoke-tests wheels for 5 platforms plus the sdist, publishes pyopenquant to PyPI and openquant to crates.io, and creates the GitHub Release from this changelog section. A dry run of the same workflow on main passed (run 36813721189).

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