fix: restore iota blocks, asm --format flag and prose after the syntax pass

CHANGELOG.md

@@ -625,7 +625,7 @@ objects.
   `GLOBL` in the file defines no longer aborts assembly — it is recorded
   as an external relocation (`Image.Externals`, `FuncLayout.Relocs`) and
   becomes an undefined global symbol in the object output.  The raw image
-  format (`--format raw`, the default) still reports them: only an object
+  s (`--format raw`, the default) still reports them: only an object
   file can represent a reference the linker must resolve.
 
 ### Changed
@@ -726,7 +726,7 @@ The formatter behaves like `go fmt` and canonicalises block separation.
 
 ### Changed
 
-- `format`: canonical blank-line layout — a new block (a label, `TEXT` or
+- `s`: canonical blank-line layout — a new block (a label, `TEXT` or
   `GLOBL`) is preceded by exactly one blank line, neither more nor less.
   Comments leading a block stay with it (the blank line goes before them),
   stacked labels share their block, the function's first label keeps hugging
@@ -761,7 +761,7 @@ the encoder learns the legacy SSE moves.
   *first* operand on arm64, riscv64 and loong64; Plan 9 spelling puts it last
   on every architecture Go supports.  The def/use and save/restore
   classification on those architectures was inverted.
-- `format`: a comment that follows a `RET` (typically the next function's doc
+- `s`: a comment that follows a `RET` (typically the next function's doc
   comment) is no longer indented as if it were still inside the finished
   function body.
 
@@ -934,7 +934,7 @@ Initial release — the Phase 1 foundation.
   Zero error-severity diagnostics across the 90-file Go runtime corpus and the
   production go-flac kernels (the `register-clobber` audit additionally reports
   the go-flac kernels' unsaved callee-saved register use for review).
-- `format`: an idempotent canonical formatter (operand spacing and per-function
+- `s`: an idempotent canonical formatter (operand spacing and per-function
   mnemonic alignment) that preserves comments and round-trips through the
   parser.
 - `lsp`: a Language Server Protocol server over stdio providing completion,