debug: add traceback printing to exceptions

fix: make proxy token authentication fallback fail-safe

fix: add synchronous scanning and optimize for Hugging Face Spaces 16GB memory

Fix VibeSec pipeline logic bugs, routing, feedback store, and RLS test cases

refactor(backend): use asyncio and thread pools for background tasks, optimize scanner AST utils and checks

Refactor scanner layers to use AST architecture, fix uvicorn graceful shutdown

fix(api): add self-ping keep-alive loop to prevent Render free-tier spin-down during active scans

fix: optimize Layer 7 memory footprints and prevent OOM/timeouts on Render

feat(scanner): sync dynamic secrets validation filters and entropy triaging

security: add security headers middleware, upgrade package dependencies, and resolve scanner false positives

fix(scanner): resolve base64 file corruption and route classification bugs, sync AST upgrades

feat: implement dynamic Semgrep rules sync engine, secure admin endpoint and offline rulesets

fix(api): map SQLi, XSS, XXE, and other injection findings to the newly allowed 'injection' category

fix: secure dynamic fallback for backward compatibility in production

fix: resolve proxy authentication 401 unauthorized

security: implement secure path traversal, SSRF mitigation, rate limiting, and Joern injection sanitization

fix: align database scans table update with the correct Postgres schema (remove scan_metadata and vulnerabilities_count)

fix: map scan finding categories strictly to vulnerabilities_category_check database constraints

fix: add GET and HEAD root path handlers for Render health check

fix: scans table constraint and robust parsing of OSV CVSS score vectors

feat: execute scan engine asynchronously in background task and support VIBESEC_PROXY_TOKEN

debug: print token and service key details

fix: sanitize environment variables by stripping quotes

fix: support service-role key authorization for background scans

feat: secure Python backend engine v2.0