…row statement (#22722)

## Summary

In `minimize_statements`, the dead-after-jump branch silently drops statements without flagging the peephole fixed-point loop as having changed. That leaves stale reference counts in `Scoping` until the next iteration kicks in for unrelated reasons — and in some cases, no further iteration ever happens, so the downstream cleanup never runs.

### Repro

```js
export function f() {
  var x = {};
  throw new Error('boom');
  module.exports = x;
}
```

Expected: `export function f() { throw new Error('boom'); }`.
Actual (before fix): `export function f() { var x = {}; throw new Error('boom'); }` — the dead `module.exports = x` is removed, but the now-orphaned `var x = {}` survives because the unused-declarator pass reads stale scope counts.

### Fix

In the dead-stmt-drop branch, set `ctx.state.changed = true` so the next iteration's `LiveUsageCollector` refreshes scope counts and unused-declarator cleanup runs.

To avoid an oscillation where dropping a bare `var x;` and immediately re-hoisting an identical `var x;` (via `KeepVar`) looks like progress, gate the flag on `dead_drop_mutates_ast`: drops of `var <id>[, <id>]*;` (no initializers) are byte-identical no-ops and don't flag.

Two related cases were also fixed in this commit after code review:

1. **Coalescing** — `throw; var x; var y;` → `throw; var x, y;`. Each individual identity-drop looked byte-identical, but the combined re-emit is a real change. Count identity drops; flag changed when more than one was harvested.
2. **Rehoist-then-remove** — when the rehoisted `var x;` is itself unused and `remove_unused_variable_declaration` drops it, the net effect is removing a declaration. Flag changed in that `None` branch.

### Tests

- New `dead_after_throw_drop_triggers_unused_declarator_removal` in `dead_code_elimination.rs`.
- All 505 existing minifier tests pass.

Stacked under #22729.

### 🚀 Features

- e857b0c napi/minify: Expose legalComments option and result (#20370)
(Boshen)
- 661132d parser: More friendly error messages for rest assignment
target and rest binding element (#22719) (sapphi-red)
- ee659b6 transformer/legacy-decorator: Add `strictNullChecks` option
for nullable-union design:type (#22266) (Kyle Cannon)

### 🐛 Bug Fixes

- e1d064e transformer/class-properties: Reparent lifted private method
helpers (#22716) (Cameron)
- 4ac0fca minifier: Preserve `0 && (module.exports = { ... })`
cjs-module-lexer hint (#22729) (Dunqing)
- 40ff611 minifier: Mark peephole loop changed when dropping
dead-after-throw statement (#22722) (Dunqing)
- 2f7b210 codegen: Emit pife-arrow/function leading comments inside the
wrap (#22720) (Dunqing)
- e184f74 parser: Improve invalid `import` property access diagnostic
(#22693) (camc314)
- 7baed9c transformer/private-method: Clear inherited strict flags
(#22508) (camc314)
- a9ad27e parser: Keep annotation comments leading without preceding
newline (#22711) (Dunqing)
- 9ea4d64 minifier: Re-evaluate pure/no-side-effects flags after
peephole inlining (#22595) (Dunqing)
- 07afbb6 minifier: Drop empty-body IIFE wrapper when called with
arguments (#22589) (Dunqing)
- fa7c463 semantic: Correct TS enum member symbol spans (#22689)
(camc314)
- 26b9396 semantic: Resolve parameter decorators outside parameter scope
(#22623) (camc314)
- b284045 parser: Switch to module goal eagerly on `export` (#22684)
(Boshen)
- dfa931d semantic: Propagate unresolved auto-increment enum value
instead of defaulting to 0 (#22646) (Dunqing)
- 69a6ba6 transformer/legacy-decorator: Emit Array for ReadonlyArray<T>
in decorator metadata (#22265) (Kyle Cannon)
- e421ef0 transformer/legacy-decorator: Return runtime binding for
design:type (#22640) (Dunqing)
- d61e1d7 codegen: Preserve verbatim text of pure/no-side-effects
comments (#22525) (Dunqing)
- 702b14e minifier: Preserve IIFE structure in DCE-only mode (#22547)
(Dunqing)
- 917da24 parser: Apply PURE comment through member-access chains
(#22566) (Dunqing)
- a069b1c codegen: Preserve quotes for cjs-module-lexer equality strings
(#22551) (Dunqing)

### ⚡ Performance

- 2f623b0 semantic: Skip unresolved checks for re-exports (#22660)
(camc314)
- 0d9553d semantic: Early-exit `check_object_expression` for objects
with <2 properties (#22668) (Dunqing)
- d721ad9 semantic: Use direct grandparent lookup for TS type parameters
(#22658) (camc314)
- 0aff288 semantic: Reorder numeric literal strict mode checks (#22657)
(camc314)
- 4d5ddb1 semantic: Reorder binding identifier checks (#22656) (camc314)
- e32acd8 semantic: Reorder identifier ambient binding check (#22653)
(camc314)
- 09fe178 semantic: Reorder ident reference strict mode check (#22652)
(camc314)
- 4b6add2 semantic: Avoid duplicate ident clone for bindings (#22663)
(camc314)
- 82f9662 parser: Check identifier kind before context flag (#22662)
(camc314)
- d7cd951 parser: Fast path identifier parsing and inline operator
helpers (#22650) (Boshen)
- 7b84314 semantic: Use direct byte access for numeric leading-zero
check (#22642) (camc314)
- 0345a31 semantic: Pre-size class elements hash map (#22618) (camc314)
- 04d3065 minifier: Drop per-call buffers in try_fold_concat (#22596)
(Dunqing)
- 4f289f1 semantic: Resolve_references_for_current_scope without a temp
Vec (#22599) (Dunqing)
- e862c15 semantic: Avoid heap alloc for var hoist scope ids (#22603)
(Dunqing)
- 8ff8674 semantic: Early return if `excess` is `0` in
`Stats::increase_by` (#22616) (camc314)
- 7a4120e semantic: Pre-reserve unresolved_references using
Stats::references (#22580) (Dunqing)

Co-authored-by: Dunqing <[email protected]>