* Materialize changelogs for reflex v0.9.6 and friends

Build the pending news fragments into CHANGELOG.md for the framework and the
modified subpackages. Each version is the next dot bump from the package's
latest release tag:

- reflex                   0.9.5.post2 -> 0.9.6
- reflex-base              0.9.5.post2 -> 0.9.6
- reflex-components-core   0.9.5       -> 0.9.6
- reflex-components-moment 0.9.1       -> 0.9.2
- reflex-components-plotly 0.9.2       -> 0.9.3
- reflex-hosting-cli       0.1.67      -> 0.1.68

Also strip the issue link embedded in the #6617/#6621 fragment text so
towncrier renders each link exactly once.

Dependency pin updates (reflex-components-core's reflex-base >= 0.9.5.post2.dev0
dev pin, and the root reflex-base floor) are intentionally left out: they pin
to as-yet-unpublished versions and must land after reflex-base 0.9.6 is
published, matching the established two-wave release flow.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017ELfV78gRoQiknTTEXctPs

* Update changelog for version reflex-hosting-cli 0.1.67

v0.1.67 was released without actually publishing the changelog, so publishing it now.

---------

Co-authored-by: Claude <noreply@anthropic.com>