Files
sx/examples
agra f5974e5846 ERR/E1.1 (slice 2): error.X value lowering + enum-like == typing
Completes E1.1. All in ir/lower.zig (the IR layer, per slice 1's finding).

- lowerFieldAccess intercepts `error.X` (parsed as field_access(identifier
  "error", X)) → lowerErrorTagLiteral: interns the tag; when target_type is a
  named error set, types the value as that set and validates X ∈ set (out-of-set
  → diagnostic); otherwise emits the raw u32 global tag id (the spec's
  context-free default — not a silent guess).
- tryLowerErrorSetEquality (early branch in lowerBinaryOp) + errorSetTypeOf /
  isErrorTagLiteralNode: an error-set value or `error.X` literal forces the other
  operand to be one too, else a diagnostic ("compares only with an error.X tag or
  another error-set value; coerce with `xx`"). Both sides lower under the set type
  as context (error.X resolves + membership-checks); two bare tag literals with no
  context compare as global u32 ids. Handles both operand orders.

First ERR examples (end-to-end): 217-error-sets.sx (declared set + error.X +
== true/false + u32 coercion → "error-set result: 25", exit 25) and
218-error-set-typing.sx (out-of-set literal + tag-vs-raw-int → 2 diagnostics).

Failable `!`/`!Named` signatures and raise/try/catch/onfail semantics remain
(E1.2+). zig build, zig build test, and 256/256 examples green.
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