fix: build version and gif feature

[ethanrous]

No description provided.

[Copilot]

Pull request overview

This PR wires a build-time version string into the agno CLI (agno --version) and updates the release workflow to (a) embed that version into built binaries and (b) ensure GIF support is enabled in release builds.

Changes:

• Add AGNO_BUILD_VERSION support and a --version CLI command to print it.
• Update build.rs to rebuild when AGNO_BUILD_VERSION changes.
• Update the GitHub release workflow to set AGNO_BUILD_VERSION automatically and include the gif feature in build matrices.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
agno/src/main.rs	Adds compile-time version constant and --version command output.
agno/build.rs	Ensures rebuilds occur when the version env var changes.
.github/workflows/release.yml	Sets build version env, enables gif in features, and uses the build version for tags/releases.

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