pi-synthetic v0.23.0

a86f124: Expose Pi’s native max thinking level on hf:zai-org/GLM-5.2 (and its syn:large:text alias). GLM-5.2 now maps max -> "max" (literal, accepted by Synthetic’s OpenAI shim) instead of the previous xhigh -> "medium" fallthrough. xhigh is hidden; the two effective tiers remain off / high / max. Bump pi peer/dev deps to 0.80.7.

748e774: Apply subscription cache-read discount to Synthetic provider usage costs.
c18b9a2: Hide Synthetic web search for accounts without a subscription.