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* 🐛 Use gradient type instead of export type in SVG renderer data->gradient-def was comparing the render `type` parameter (:svg, :png, :pdf) against "linear" to decide between linearGradient and radialGradient elements. Since the export type is never "linear", the comparison always fell through to radialGradient, causing all linear gradients to be exported as radial in SVG output. Read the gradient type from the data map instead: (get-in data ["gradient" "type"]) Closes #5972 * 🐛 Add SVG gradient export regression test Extract SVG gradient definition generation from the renderer so it can be tested directly. Add exporter test build wiring and cover both linear and radial gradient output. AI-assisted-by: gpt-5.6-luna * ✨ Standardize exporter testing workflow Align exporter scripts with the frontend testing pattern. Add a dedicated GitHub Actions workflow and document the canonical exporter commands in Serena memories. AI-assisted-by: gpt-5.6-luna * ✨ Add focused exporter test execution Mirror frontend test-runner behavior for focused namespaces and test vars. Support --focus, --log-level, and --help, and document the commands. AI-assisted-by: gpt-5.6-luna * 🐛 Replace shell exec with execFile in exporter Replace child_process.exec with execFile to eliminate shell interpretation. Add hex color validation in exporter and frontend to reject malformed input before command construction. This fixes GHSA-4f36-m4hj-cv86 (CVSS 9.9 Critical), an authenticated OS command injection vulnerability where malicious fill-color values could execute arbitrary commands in the exporter container. Defense in depth: - Layer 1: execFile passes arguments directly without shell parsing - Layer 2: Exporter validates colors with strict hex regex - Layer 3: Frontend filters invalid colors before DOM emission All three independent reporters' attack vectors are addressed: - Quote breakout (lyhtheori) - Command substitution (B1gN0Se) - Path traversal (KimiSecurityTeam) AI-assisted-by: qwen3.7-plus * 🐛 Use existing hex-color-string? and fix test path mismatch Address code review feedback: - Replace duplicated hex-color-rx and valid-hex-color? with existing hex-color-string? from app.common.types.color - Fix RCE test to use marker path in payload instead of hardcoded /tmp/pwned AI-assisted-by: qwen3.7-plus --------- Co-authored-by: Sumit Ridhal <sridhal@redhat.com>