Gated WebP encoding behind OMP_NO_WEBP environment variable so that local
llama.cpp vision models (which use the STB library that lacks WebP
decoding support) can accept browser snapshots without returning HTTP 400.
Upstream reference: cline/cline PR #9837
(https://github.com/cline/cline/pull/9837) implements a similar workaround
for the same llama.cpp STB WebP incompatibility.
- Raised the Bun minimum version to >=1.3.14 across package metadata, install scripts, and changelog notes.
- Removed the Photon native image pipeline and added SIXEL-based `sixel` support in pi-natives.
- Migrated coding-agent image handling and resizing to `Bun.Image`, including updated tests and a JPEG quality bump to 80.
- Added HTTP/2 fetch bootstrap with HTTPS-only fallback and updated Bun build flags for autoload suppression/`--keep-names`.
- Reduced default image size limits to 1568px and 500KB to match Anthropic's internal thresholds.
- Optimized screenshot compression with 1024px max dimensions, 150KB budget, and 70% JPEG quality for aggressive payload reduction.
- Added fast-path optimization to skip re-encoding when images fit dimensions and are within 25% of byte budget.
- Refactored image encoding strategy to JPEG-only in quality/dimension reduction loops with improved quality ladder steps.
Chris Danis