Publish changelogs for reflex v0.9.4 release

[masenf]

No description provided.

[greptile-apps]

Greptile Summary

This PR publishes changelogs for the reflex v0.9.4 release by consuming towncrier news fragments into CHANGELOG.md files across the main package and all sub-packages, and updating CONTRIBUTING.md with the release workflow.

• News fragments under news/ and each packages/*/news/ directory are deleted and their content assembled into the corresponding CHANGELOG.md files covering deprecations, features, bug fixes, and misc changes.
• CONTRIBUTING.md gains a "Publishing CHANGELOG.md" section documenting the towncrier command for maintainers, with a minor typo fix in the "Editing Templates" section.

Confidence Score: 4/5

Safe to merge; the only concern is a documentation command that previews rather than writes the changelog.

The changelog content itself is straightforward and looks correct. The one concrete defect is in CONTRIBUTING.md: the documented release command uses --draft, which causes towncrier to print to stdout only and leave files untouched — the opposite of what the Publishing CHANGELOG.md heading promises. A maintainer following these instructions in a future release would walk away thinking the job is done when nothing was actually written.

CONTRIBUTING.md — the towncrier build --draft command in the new Publishing CHANGELOG.md section.

Important Files Changed

Filename	Overview
CONTRIBUTING.md	Added 'Publishing CHANGELOG.md' section with a towncrier build --draft command; the --draft flag only previews output and does not write the file, contradicting the stated intent.
CHANGELOG.md	New top-level changelog for v0.9.4 assembled from news fragments; content looks correct and complete.
packages/reflex-base/CHANGELOG.md	New changelog for reflex-base v0.9.4; includes orphan-fragment deprecation entry without a PR link, which is expected for that fragment type.
packages/reflex-components-markdown/CHANGELOG.md	New changelog for reflex-components-markdown at v0.9.3 (package has its own versioning cadence); single misc entry looks correct.
packages/reflex-components-radix/CHANGELOG.md	New changelog for reflex-components-radix v0.9.4 with no significant changes; placeholder entry is fine.
packages/reflex-docgen/CHANGELOG.md	New changelog for reflex-docgen v0.9.2 with no significant changes; placeholder entry is fine.

_{Reviews (1): Last reviewed commit: "Publish changelogs for reflex v0.9.4 rel..." | Re-trigger Greptile}

[codspeed-hq]

Merging this PR will not alter performance

✅ 24 untouched benchmarks

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_{Comparing masenf/changelog-reflex-0.9.4 (d53a90a) with main (bb8b6f5)}