heal.dev: Find bugs and vulnerabilities code review misses

Heal stubs external services in its sandbox: payments run through a local emulator, while Slack uses either a live API or a mock. A test fails twice, then fails again when heal re-runs it itself. What it cannot reproduce, it does not file. The v2.5.0 release on October 9 added performance testing, which targets cases such as a slow query a coding agent wrote. Heal 2.0 is rebuilt around a new agent. One sample defect is an expired discount code that still shows as applied while checkout charges the full price. Code review sees the diff of one pull request, so a bug between untouched code, config, data and a third-party service is outside it. Funding records disagree: Crunchbase lists a pre-seed round with