docs: README supply-chain badge → 'secure' [failproofai-394]

[NiveditJain]

What

Change the README supply chain badge from the live OSV-Scanner workflow-status badge (which renders passing) to a static supply chain: secure badge — still linked to the workflow runs.

Why

"secure" reads as a posture statement, which is the intent here. shields.io's GitHub Actions status endpoint can only render the run state (passing/failing), so the custom word requires a static badge.

Trade-off

A static badge won't auto-flip to red if a future scan breaks. The real enforcement remains the OSV-Scanner gate as a required status check on main (block-on-any-finding), and the badge still links to the live workflow runs so current status is verifiable.

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Configuration used: Organization UI

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📥 Commits

Reviewing files that changed from the base of the PR and between 317f74f and 26c51c9.

📒 Files selected for processing (2)

• CHANGELOG.md
• README.md

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