docs(rules): clarify proactive inbox-send vs the stop-and-ask rule

A literal reading of cross-project.md could see its new propagation section (send synced-file edits to rulesets without being told) as conflicting with the file's stop-and-ask rule. One sentence reconciles them: ask-first governs work inside another project's scope, and an inbox drop is the sanctioned alternative to that, so it needs no confirmation.

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