docs: mention namespace param for graph_search in graph prompts

[Evanfeenstra]

Why

An agent running /repo/agent with mode=graph incorrectly claimed:

graph_search accepts domains, limit, q, and type parameters, but not namespace directly—that parameter is only available in graph_neighbors and graph_get for edge counts.

graph_search does accept namespace (added in #1450), but the prompts never mention it:

• GRAPH_SYSTEM describes graph_search as scoping only with type/domains
• The graph sub-agent prompt says the same ("Scope with type/domains")
• The only prose mentions of namespace the model sees are the graph_get/graph_neighbors param descriptions, which frame it as edge-count-only

When asked what its tools accept, the model reproduced the prompt summary instead of the schema — verbatim the wrong claim above.

What

One-line additions to both prompts noting that graph_search can scope to a data partition with namespace. No behavior change; schemas were already correct.

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