ShioriCode v0.5.4

What's Changed

• Opus 5 default + xhigh/ultracode effort tiers (agent SDK 0.3.215) by @FujiwaraChoki in #16
• Harden auth, state file permissions, and the mobile device store by @FujiwaraChoki in #17
• Cut cold-start latency for the desktop dev loop by @FujiwaraChoki in #18
• Make the headless service and Link survive real-world failures by @FujiwaraChoki in #19
• Composer effort slider, peak-effort ring, and cheaper blitz animation by @FujiwaraChoki in #21

Full Changelog: v0.5.3...v0.5.4