feat: add trufflehog secret scanning

[rohan-naik]

Adds trufflehog-based secret scanning, mirroring contentstack/rte-micro-frontend#66.

What

Secrets are checked at three points, all running the same scripts/trufflehog-scan.sh so CI and developer machines cannot drift apart:

Where	Trigger
.husky/pre-commit	every git commit
.husky/pre-push	every git push
.github/workflows/secret-scan.yml	PRs, and pushes to master

The script scans the current filesystem — tracked + untracked non-gitignored files, mirrored into a temp tree — rather than git history or the PR diff. Two consequences worth noting:

• A secret already present on the branch is reported whether or not this PR introduced it.
• Gitignored local files (e.g. an .npmrc auth token) are excluded from the scan set, so they cannot fail anyone's hook.

The script fails closed: a missing trufflehog binary, a git/rsync failure, or an empty scan set all abort rather than pass, on the principle that an unverifiable tree is not a clean one.

Deviations from the source PR

Both are repo-specific, not stylistic:

• prepare was already npm run build (needed for publishing this package), so husky is chained as npm run build && (husky || true) rather than replacing it. The || true keeps npm publish and consumer installs working in checkouts with no git directory.
• lib/ added to scripts/trufflehog-exclude.txt, as it's this repo's build output.

Testing

Verified locally against both paths:

• Clean tree → exit 0, no secrets found. The hooks fired on this branch's own commit and push.
• Planted AWS key → exit 1, secret reported with file and line, commit blocked.

Note that findings come through as unverified when trufflehog can't reach the provider to confirm a key is live; the script still blocks, matching #66 (--results=verified,unknown,unverified). Expect occasional false positives on high-entropy test fixtures — --no-verify is the escape hatch.

The workflow itself is unverified until it runs on this PR; please confirm the Secret Scan check goes green before merging.

Contentstack developers will need brew install trufflehog locally, or their commits will be blocked with install instructions.

🤖 Generated with Claude Code

[snyk-io]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues
✅	Licenses	0	0	0	0	0 issues
✅	Code Security	0	0	0	0	0 issues

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[github-actions]

🔒 Security Scan Results

ℹ️ Note: Only vulnerabilities with available fixes (upgrades or patches) are counted toward thresholds.

Check Type	Count (with fixes)	Without fixes	Threshold	Result
🔴 Critical Severity	0	0	10	✅ Passed
🟠 High Severity	0	0	25	✅ Passed
🟡 Medium Severity	0	0	500	✅ Passed
🔵 Low Severity	0	0	1000	✅ Passed

⏱️ SLA Breach Summary

✅ No SLA breaches detected. All vulnerabilities are within acceptable time thresholds.

Severity	Breaches (with fixes)	Breaches (no fixes)	SLA Threshold (with/no fixes)	Status
🔴 Critical	0	0	15 / 30 days	✅ Passed
🟠 High	0	0	30 / 120 days	✅ Passed
🟡 Medium	0	0	90 / 365 days	✅ Passed
🔵 Low	0	0	180 / 365 days	✅ Passed

✅ BUILD PASSED - All security checks passed