Add self-healing stack verifier

[giaphutran12]

Summary

• adds make verify-self-healing for backend tests, backend build, Mastra adapter syntax, and no-key benchmark blocked-contract smoke
• adds explicit live modes for real 2-prompt benchmark and dataset-id self-healing smoke
• documents current self-healing populate path and verification commands

Verification

• make verify-self-healing passed: backend tests 47/47, backend build, adapter syntax, no-key benchmark smoke blocked cleanly
• bash scripts/verify-self-healing-stack.sh --convex-push --dataset-id dataset-ai-posts --skip-local --no-blocked-smoke blocked cleanly on missing frontend/.env.local and CONVEX_SELF_HOSTED_ADMIN_KEY

Notes

• No auto-merge.
• Live benchmark/dataset smoke are explicit because they may spend OpenRouter/TinyFish credits.
• Current local live canary remains blocked by missing local env/Convex prerequisites, not by verifier code.

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• Commit unit tests in branch codex/self-healing-verification

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