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The type-convergence side of E1.4 (the SCC slice). A bare `-> !` function's error set is now converged whole-program from its literal raises plus the sets of the pure-failable functions it `try`s. - convergeInferredErrorSets: a pre-lowering fix-point pass (lowerRoot Pass 1d, after scanDecls / before body lowering) that walks each top-level bare-`!` function's body AST (collectErrorSites, stopping at nested-fn boundaries) for literal `raise error.X` tags + pure `try g()` edges, then unions each set with its edges' sets until stable. Stored in a side map `inferred_error_sets` (fn name -> sorted []u32) — sidesteps the name-only error-set interning collision (the shared `!` placeholder stays empty). - lowerTry widening: a named caller `try`-ing a bare-`!` callee now checks the callee's converged set (previously a false-negative — the empty placeholder was trivially a subset). Factored diagTagsNotInSet out of checkErrorSetSubset. - empty-inferred warning: a top-level non-main bare-`!` function with an empty converged set warns. Not user-visible yet (the compile driver renders diagnostics only on failure — a LANG follow-up), so unit-tested on the DiagnosticList. - corrected two now-stale bail messages (failable-`or` -> E2.4; value-carrying `try` -> E2). Deferred to E2.4: failable-`or` chains / value-terminators (and `try` fallback routing) — gated on the value-carrying tuple ABI. Tests: examples/223-inferred-error-sets.sx (transitive convergence + widening passes, exit 7), examples/224-inferred-widening-reject.sx (transitive widening rejection, exit 1), unit test in lower.test.zig. Gates: zig build, zig build test, 262/262 examples.
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