Context

PR #2235 added TopologyClassifier::analyze() that calls compute_longest_path_and_depths once, then calls classify() which internally calls it again (twice). Total: 3-4 toposort passes per analysis instead of the intended O(|V|+|E|) single pass.

Fix

Refactor classify() to accept pre-computed (longest_path, depths) values from the caller. analyze() computes once and passes to classify().

Impact

Performance only — no correctness issue. Matters for large task graphs (50+ nodes).