fix: Move get-actor-list out of the default actors category

[jirispilka]

Why

Closes #1464

Since 0.17.0 get-actor-list was in the default actors category). It overlaps with search-actors for "find my Actor" requests and it was published without proper evals (my bad)

This is a temporary solution until we have evals for the tool; then it goes back into a category.

What changed

Before: get-actor-list in actors, so in the default set and in tools=actors.
Now: in no category. Served only when named: tools=get-actor-list.

Proof it works

mcpc against the built stdio server:

Case	Result
default session	no get-actor-list; search-actors has no hint
--tools=get-actor-list	tools/list = ["get-actor-list"]; no Actor fetch, no run tools
tools-call get-actor-list	isError: false, structuredContent with the account's Actors
--tools=actors,get-actor-list	actors tools + 4 auto-injected + get-actor-list; hint present

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commit: 3a2266f