2.9.5 — Fix intermittent Power showing off while projector is on

Fixed

• Power switch intermittently flipping to `off` while the UHD60 is actually on. v2.9.1 stripped the UHD60's console-echoed prompt (`Optoma_PJ> `) once per reply, but debug logs showed it sometimes doubles up (`Optoma_PJ> Optoma_PJ> OK1`). A single strip left `Optoma_PJ> OK1` behind, which still failed to parse — and for the power switch specifically, an unparseable reply silently evaluated as `off` with no way to distinguish it from a genuine off state.
• The strip now loops until a real protocol marker (`Ok`/`P`/`F`/`INFO`) surfaces, instead of stopping after one pass. Also guards against genuinely unparseable input looping forever.

This should fix any entity that occasionally showed a stale/wrong value on the UHD60, not just Power — it was the same underlying parse failure wherever it landed.