fix(certstream): correct URL to calidog.io (typo in M3 spec: calidus→calidog)

fix: autofix unused imports (F401)

fix: resolve 69 syntax errors from misindented imports and broken function defs

fix: ruff auto-fix for 50 lint errors (T01)

fix: enable pytest, fix 4 failing tests, fix x402 imports, remove unused requests imports

clean slate: removing all old data, fresh build