fix(checker): semver-correct prerelease comparison and general pseudo-versions
Compare prerelease identifiers per semver §11 (numeric parts numerically, handling multi-digit counters like rc2->rc10) and detect the embedded timestamp in any Go pseudo-version form for date ordering. Prune runner tasks only once new work is confirmed so no-op invocations don't wipe the UI history. Adds semver comparison tests.
3 files changed+101−24
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