chore: import upstream snapshot with attribution

strix/tools/view_image/README.md

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+# view_image
+
+SDK-provided tool that loads an image from the sandbox workspace and
+returns it as an image content block for vision-capable models.
+
+- **Implementation:** `agents.sandbox.capabilities.tools.view_image.ViewImageTool`
+  (upstream `agents` SDK)
+- **Wired in:** `strix/agents/factory.py` — added per-run via the SDK
+  `Filesystem` capability.
+- **Strix defaults:** screenshots default to
+  `/workspace/.agent-browser-screenshots/` via `AGENT_BROWSER_SCREENSHOT_DIR`
+  (set in `containers/Dockerfile`; dir is created at container start in
+  `containers/docker-entrypoint.sh`).
+- **Skill:** screenshot workflow lives in `strix/skills/tooling/agent_browser.md`.
+- **Recovery:** vision-not-supported model rejections are auto-recovered
+  via `strix.core.sessions.strip_all_images_from_session`, invoked from
+  `strix/core/execution.py`.