Files
sx/examples
agra a3ff503f47 ERR/E3: error-tag {} interpolation via an always-linked tag-name table
`{}` on an error-set value printed `<?>` (any_to_string had no error_set
category). Now it renders the tag name (`BadDigit`), reusing the existing
any_to_string dispatch.

Pieces:
- New `error_tag_name_get` IR op (UnaryOp): tag id -> name. Lowered from a new
  `error_tag_name(e) -> string #builtin` (std.sx). Handled across inst.zig
  (op def), print.zig, interp.zig (comptime: tags.getName), and emit_llvm.zig.
- emit_llvm getOrBuildTagNameArray: an always-linked `[N x {ptr,i64}]` global
  of tag names indexed by global tag id (the TagRegistry namespace, slot 0 =
  ""). error_tag_name_get zext's the u32 tag value and GEPs into it. Built once;
  not trace-gated, so it works in release too (per the spec's "tag-name table
  always shipped").
- resolveTypeCategoryTags gains an `error_set` category so the
  `case error_set:` arm in any_to_string matches; that arm coerces the Any to
  u32 (`xx val`) and calls error_tag_name. (cast(type) didn't recover the tag
  id for error-set values; the u32 coercion does.)

examples/240-error-tag-interpolation.sx: bound tags + a catch-bound tag print
their names. Regenerated ffi-objc-call-06-sret-return.ir — pure block-renumber
drift from adding one if-arm to the shared any_to_string (verified
semantically identical after collapsing block numbers).

Gates: zig build, zig build test, bash tests/run_examples.sh (277 passed; lone
failure is the user's uncommitted 213-canonical-map pack WIP).
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