A security team can patch a vulnerability and still leave an attacker another route to the same data. The harder question is whether weaknesses across applications, identities, and infrastructure can be combined into a working intrusion. CodeWall is building its business around answering that question continuously. The London startup has emerged from stealth with $4 million in pre-seed funding led by Osney Capital, with participation from InReach Ventures, Antler, and angel investors, according…