[MacallanTheRoot]

anicraft_render returns × between the stage width and height because the caption formatter contains that malformed literal. Replace it with the Unicode multiplication sign ×.

Extend the existing MCP render test to assert the complete caption (frame 3, scene 0, 25%, and 1280×720 stage), the successful image/text response structure, and a base64-decodable PNG that decodes to 320×180 pixels. Existing invalid-frame and invalid-scale assertions remain in place. No dependencies or unrelated files change.

The regression test was executed against the original implementation and failed specifically on 1280×720 versus 1280×720; it passes with the fix.

Validation:

• cargo test -p anicraft-cli --locked: passed, 13 tests.
• cargo test --workspace --no-default-features --locked --no-fail-fast: passed.
• cargo clippy -p anicraft-cli --all-targets --locked -- -D warnings: passed.
• cargo clippy --workspace --no-default-features --features gpu-stage --all-targets --locked -- -D warnings: passed.
• git diff --check: passed.

Environment limitations:

• Default-feature workspace tests, workspace Clippy, and the screenshot command cannot build because the ALSA development files (alsa.pc) are missing.
• cargo fmt --all -- --check reports existing formatting differences. The changed file has identical rustfmt findings on upstream main and this branch; unrelated formatting is left untouched.
• cargo deny check licenses bans sources cannot run because cargo-deny is not installed.
• Workspace Clippy with all default features disabled reports six dead-code errors in unchanged src/gpu_watch.rs. Enabling gpu-stage while leaving sound disabled passes, as listed above.

Opened as a draft because default-feature and dependency-policy verification remain incomplete locally. After PR creation, CI, CI (macOS, Windows), Web, and SonarCloud all report action_required; no jobs or test results are available yet.

Fixes #311

[coderabbitai]

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