Guard analyzing-data Stop hook against missing uv

[Purple-Drain]

Problem

The analyzing-data skill's Stop hook is registered directly in plugin.json
as:

"command": "uv run ${CLAUDE_PLUGIN_ROOT}/skills/analyzing-data/scripts/cli.py stop"

On a machine where uv isn't installed / isn't on PATH, the shell fails to
exec uv before cli.py ever starts — so cli.py's own
check_uv_installed() helpful-error path never runs. Instead every Stop hook
invocation surfaces a raw, unhelpful error:

Stop hook error: Failed with non-blocking status code: /bin/sh: 1: uv: not found

This fires on every single turn for any user without uv on PATH, in both
Claude Code and Cursor (both plugin manifests have the same unguarded
command).

Fix

Move the command into a small co-located skills/analyzing-data/hooks/stop.sh
script — the same pattern already used by
skills/airflow/hooks/warm-uvx-cache.sh elsewhere in this repo — that checks
for uv on PATH and no-ops (exit 0) if it's missing, since a kernel could
never have been started without uv in the first place, so there's nothing
to stop.

Both .claude-plugin/plugin.json and .cursor-plugin/plugin.json now point
at this script instead of embedding the raw uv run command inline.

Testing

Ran the new script directly, both with uv present and with PATH
restricted to simulate uv missing:

$ ./skills/analyzing-data/hooks/stop.sh
...
Kernel not running
exit: 0

$ env PATH="/usr/bin:/bin" ./skills/analyzing-data/hooks/stop.sh
exit: 0

No error output in the missing-uv case, clean exit in both.

[Purple-Drain]

@claude thoughts on these?

[Purple-Drain]

@copilot pls help resolve and revie wpls