rexcode/x86: generate the encode-recipe table (drop the @init interim)

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Move ENCODE_RECIPES from a startup-built (@init) static table in the library to
a generated, #loaded table like every other one. The tablegen runs
form_to_recipe over every form, serializes to x86.encode_recipes.bin, and the
loader #loads it -- no @init, no allocation; the forms remain the single source
of truth and the recipe is derived from them.

- tablegen/gen.odin: ENCODE_RECIPES added to the BLOBS manifest (which drives
  both the Stage B serializer and the loader's #load); emit the generated-package
  global plus an @init that fills it from ENCODE_FORMS via lib.form_to_recipe.
- encoder_recipe.odin: drop the @init, the static storage, and the ENCODE_RECIPES
  declaration. form_to_recipe stays -- now solely the tablegen-time derivation.
- tables.odin, generated/{encode_tables,writer}.odin: regenerated.
- tables/x86.encode_recipes.bin: the generated blob (28260 bytes = 2355 x 12).

No behavior change: the recipes are identical to the @init ones. gen / builders /
check / test / idempotent green (2282 cases, 22 byte-stable artifacts); encode
perf unchanged.

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