[AI-0317] feat(vocab): align host validators with runtime grammar

[Xuepoo]

Widen both host validate_tool_name copies to [a-z0-9_.-] + 64B, byte-equivalent to runtime. Disposes CodeRabbit PR#509 finding (replied there, tracked here).\n\nReview: APPROVE (PX-1384 ai-0317-reviewer).\nGates: just check + act -n, green.\n\nPriority: P1 | Area: vocabulary | Labels: feat,P1 | Milestone: v0.1.0 | RFC: n/a | Task: AI-0317 | Closes: #510

[coderabbitai]

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• crates/bitty-ai-host/src/mcp_placement.rs
• crates/bitty-ai-host/src/tool_dispatch.rs

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