Grouping noisy errors

The same error can be reported as dozens of separate issues when stack frames or messages contain volatile data — random IDs, dynamic file paths, build hashes, anonymous function names. The fix is two-step: merge the existing issues into one target, then create a grouping rule so future events from the same call site share a single canonical fingerprint instead of spawning new ones.

Important up front: "same error" here is narrow. Two issues that share a name or a sentence of message text but came from different code paths, different SDKs, or different runtimes are different errors and should stay separate, even if the user thinks of them as "the same kind of bug". Grouping a frontend TypeError together with a backend TypeError because both messages contain "undefined" destroys the signal that lets the team find each one. The criteria in step 1 exist to keep that from happening.

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