release: v2.2.2

[radiosilence]

Summary

Cuts v2.2.2 over the bundle of post-v2.2.1 changes:

• feat(mcp): cap + TTL the NonceStore #27 NonceStore cap + TTL (closes mcp: cap or TTL the NonceStore #25)
• chore: bump kreuzberg 4.4 -> 4.8 #28 kreuzberg 4.4 → 4.8
• chore: bump toml 0.8 -> 1.1 #29 toml 0.8 → 1.1
• chore: bump rmcp 0.12 -> 1.5 + schemars 0.8 -> 1.2 #30 rmcp 0.12 → 1.5 + schemars 0.8 → 1.2

Test plan

• `cargo build` — clean
• Pure Cargo.toml/CHANGELOG bump on top of already-verified main
• CI green → auto-tags v2.2.2

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