v26.10.3

Plugin package version 26.10.3. The mariadb-shell MCP server floor
(MARIADB_SHELL_VERSION) stays at 26.10.1, still the newest mariadb-shell
release; it did not move in this release.

Hermes Agent is the fifth harness. This is the first release of its
three plugins, mariadb-dev, mariadb-sql and mariadb-contributor, which
are portable Agent Plugins v1 packages installed with
"hermes plugins install mariadb/ai-plugins#hermes/-plugin
--enable". They pass Hermes' install-time security scan and need no
--force.

The five REST Service skills now follow the REST SQL of MariaDB Shell's
built-in mrs module with metadata schema 5.0.0 (schema
mariadb_rest_service, auth vendor MARIADB, the new SHOW REST and DROP
REST DAEMON statements), and several of their examples that were syntax
errors are fixed. When the launcher cannot install mariadb-shell, its
error message now suggests downloading the installer and running it
rather than piping curl into bash.

Skills were re-vendored from mariadb-docs at cc8dd40 and from
mariadb-shell at 37cb1d3. The Connector/C, C++, ODBC and Python install
skills and mariadb-features no longer run privileged commands: the agent
hands root steps to the user and waits, and the skills add builds into
$HOME/.local that need no root. The contributor skill create-shell-plugin
gets a small correction. Counts stay at 85 dev, 47 sql and 3 contributor
skills.

See each plugin's CHANGELOG.md [26.10.3] section for details.