feat: Support GIF parsing

[ethanrous]

No description provided.

[Copilot]

Pull request overview

This PR adds GIF (multi-frame) decoding support to the agno crate, wiring it through the Rust API, CLI conversion flow, and Go/FFI surface so GIF frames can be loaded similarly to PDF pages.

Changes:

• Introduces a native GIF decoder (including LZW decompression) and a public frame-count/frame-decode API behind a new gif feature (enabled by default).
• Adds GIF loading to the auto-loader and extends the CLI convert --page flow to support GIF frames (with vertical stacking for multi-page/frame exports).
• Updates the exported FFI/Go bindings to load “pages” from either PDF or GIF via a unified entry point, plus adds integration/unit tests for GIF decoding.

Reviewed changes

Copilot reviewed 15 out of 16 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
Cargo.lock	Adds transitive crates for GIF support in dev/test (gif, weezl, color_quant).
bindings/go/agno/agno.h	Updates generated header to expose load_image_page when PDF/GIF enabled.
bindings/go/agno/agno.go	Enables AGNO_GIF and switches Go OpenPage to call load_image_page.
agno/tests/gif_decode_tests.rs	Adds integration tests validating frame counts, decoding correctness, and loader bridging.
agno/src/main.rs	Adds GIF --page conversion support and refactors page stacking into a shared helper.
agno/src/lib_interface.rs	Replaces load_pdf_page with load_image_page and dispatches by file magic (PDF vs GIF).
agno/src/exif/mod.rs	Treats GIF as EXIF-less (returns empty context).
agno/src/codec/mod.rs	Adds codec::gif module behind the gif feature.
agno/src/codec/gif/mod.rs	Defines public GIF codec API exports (decode_gif_frame, gif_frame_count).
agno/src/codec/gif/lzw.rs	Implements GIF-specific LZW decompression with unit tests.
agno/src/codec/gif/decode.rs	Implements GIF parsing, frame compositing/disposal handling, and decoding tests.
agno/src/agno_image/load/mod.rs	Exposes new GIF loader module and re-exports its functions.
agno/src/agno_image/load/load.rs	Extends type detection + auto-loader to support GIF (frame 0).
agno/src/agno_image/load/gif.rs	Adds load_gif_frame_from_bytes bridging codec output into AgnoImage.
agno/cbindgen.toml	Maps gif feature to AGNO_GIF for header generation.
agno/Cargo.toml	Adds gif feature (default-enabled) and enables image dev-dep GIF support for tests.

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