Release toolchain-lite 0.1.0 to PyPI (waiting on the user's steps) #73

Tracks toolchain-lite 0.1.0 (#69, #70). Everything on our side is done once #72 merges; what's left is the user's.

Done

• CI: Release toolchain-lite 0.1.0 on PyPI as native tcl wheels #70 is merged: native tcl wheels for 4 platforms, publish-pypi.yml, tcl --help/--version.
• CI: Tag toolchain-lite releases toolchain-lite-v<version> #72 (tag toolchain-lite-v<version>, so v* stays the Gradle plugin's) is in CI.
• The pypi environment accepts toolchain-lite-v* tags only.
• Draft Release toolchain-lite-v0.1.0, target main, with notes.

User steps, in this order (publishing tags main's current head):

1. On PyPI project toolchain-lite, add a trusted publisher: owner thisisthepy, repository toolchain, workflow publish-pypi.yml, environment pypi.
2. Merge release→main PR Release: merge release into main #64 once it carries CI: Tag toolchain-lite releases toolchain-lite-v<version> #72. Main is locked, so unlock it to merge.
3. Publish the draft Release toolchain-lite-v0.1.0.
4. Yank toolchain-lite 0.0.1 on PyPI. It packed the old Gradle module's sources and installs no tcl.

Done when uv tool install toolchain-lite installs 0.1.0 and tcl --version prints tcl 0.1.0.