v26.9.5

Plugin package version 26.9.5, with the mariadb-shell MCP server floor
(MARIADB_SHELL_VERSION) pinned to 26.9.5 across all ten plugins. The two
versions are set by different scripts and are independent of each other;
they happen to coincide at this release. mariadb-shell 26.9.5 was
already released when the floor moved.

New skills: the dev plugins gain three Laravel skills, contributed by
@Rhaima96 (mariadb-laravel-connector, mariadb-laravel-vector and
mariadb-laravel-ai-sdk), bringing them to 85. The contributor plugins
gain split-scripted-test, vendored from mariadb-shell at 938d473, for
splitting and rebalancing long scripted tests into parallel groups;
they now have 3 skills.

Skills were re-vendored from mariadb-docs at 3a0974f, which corrects
the sample EXPLAIN / ANALYZE output in mariadb-explain (dev and sql).
The sql plugins stay at 47 skills.

Also in this release: the DevHub is now served only from
https://ai-plugins.mariadb.org/ (docs only, not shipped inside any
plugin).

See each plugin's CHANGELOG.md [26.9.5] section for details.