Add VulnGraph agent harness article cover

[copyleftdev]

What changed

Adds the wide PNG cover art for the dev.to article about using VulnGraph in agent and harness workflows.

Why

The article needs a publicly reachable, stable cover image URL for its dev.to frontmatter.

Validation

• Confirmed PNG dimensions: 1935×813
• Confirmed the immutable raw GitHub URL returns HTTP 200 with content-type: image/png

[coderabbitai]

Important

Review skipped

Review was skipped due to path filters

⛔ Files ignored due to path filters (1)

• docs/assets/devto-vulngraph-agent-harness-cover.png is excluded by !**/*.png

CodeRabbit blocks several paths by default. You can override this behavior by explicitly including those paths in the path filters. For example, including **/dist/** will override the default block on the dist directory, by removing the pattern from both the lists.

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 1698053d-3f72-42a4-a3be-16ddf63c30ef

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch agent/devto-agent-harness-cover

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