refactor(stdlib,tests,examples)!: migrate record literals to #{ [#218]

Mechanical companion to the `#{` grammar change — 45 in-repo `.affine`
files (stdlib, tests, golden oracles, e2e fixtures, examples) rewritten
from legacy `{ … }` record literals to `#{ … }`.

Method: a sound, convergent codemod that depends ONLY on the new,
unambiguous grammar (never the old ambiguous parser): parse with the
new grammar, and at each parse error insert `#` before the innermost
enclosing record `{`, iterating to a fixed point. Codepoint-correct
(handles non-ASCII). The codemod tooling is intentionally not committed.

Result: `dune runtest` = 257/257 green (the #218 gate), identical to
the pre-change baseline — no regression; `#{` is now the record syntax
across the full test suite.

Out of scope (tracked, per the #218 plan steps 3–4):
  - estate-wide `.affine` sweep in other repos;
  - ~24 non-gating files the convergent codemod did not auto-migrate
    (LR error reported past the record's `}`): conformance/valid/*,
    docs/guides/warmup/*, codegen-deno/*, some tests/types/* — plus the
    intentional conformance/invalid/* error fixtures and face-syntax
    examples which must stay as-is. None are in the 257 gate.

Refs #218 #215

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

affinescript-deno-test/example/codegen_regression_test.affine

@@ -40,7 +40,7 @@ fn advance(s: Lifecycle) -> Lifecycle {
 }
 
 fn make_counters() -> Counters {
-  { tag: 1, profile_id: 42, activity_count: 7 }
+  #{ tag: 1, profile_id: 42, activity_count: 7 }
 }
 
 fn read_profile_id(c: Counters) -> Int {

conformance/valid/011_rows.affine

@@ -9,7 +9,7 @@ fn get_name[..r](entity: {name: String, ..r}) -> String {
 }
 
 fn with_id[..r](record: {..r}, id: Int) -> {id: Int, ..r} {
-  { id: id, ..record }
+  #{ id: id, ..record }
 }
 
 type HasPosition[..r] = {x: Int, y: Int, ..r}

examples/comprehensive_test.affine

@@ -12,7 +12,7 @@ enum Shape {
 }
 
 fn vec2_add(a: Vec2, b: Vec2) -> Vec2 {
-  { x: a.x + b.x, y: a.y + b.y }
+  #{ x: a.x + b.x, y: a.y + b.y }
 }
 
 fn area(s: Shape) -> Int {
@@ -30,7 +30,7 @@ fn larger_area(s1: Shape, s2: Shape) -> Int = max(area(s1), area(s2));
 
 fn main() -> () {
   let circle = Circle(5);
-  let rect = Rect({ x: 3, y: 4 });
+  let rect = Rect(#{ x: 3, y: 4 });
   let result = larger_area(circle, rect);
   ();
 }

examples/rows.affine

@@ -15,5 +15,5 @@ struct Point3D {
 fn getX(p: Point2D) -> Int = p.x;
 
 fn mk_point(x: Int, y: Int) -> Point2D {
-  { x: x, y: y }
+  #{ x: x, y: y }
 }

examples/typecheck_complete_test.affine

@@ -15,11 +15,11 @@ enum Color {
 }
 
 fn make_point(x: Int, y: Int) -> Point {
-  { x: x, y: y }
+  #{ x: x, y: y }
 }
 
 fn origin() -> Point {
-  { x: 0, y: 0 }
+  #{ x: 0, y: 0 }
 }
 
 fn mutate_counter() -> Int {

stdlib/testing.affine

@@ -303,7 +303,7 @@ fn bench(f: () -> (), iterations: Int) -> BenchResult {
   }
 
   let tot = time_now() - start;
-  {
+  #{
     iterations: iterations,
     total_time: tot,
     avg_time: tot / float(iterations)

test/e2e/fixtures/counter.affine

@@ -68,7 +68,7 @@ fn counter_subs(model: Int) -> String {
 // Wire up the TEA runtime and hand off to the interpreter loop.
 
 fn main() -> () {
-  tea_run({
+  tea_run(#{
     init:          counter_init,
     update:        counter_update,
     view:          counter_view,

test/e2e/fixtures/full_pipeline.affine

@@ -13,7 +13,7 @@ enum Shape {
 }
 
 fn vec2_add(a: Vec2, b: Vec2) -> Vec2 {
-  { x: a.x + b.x, y: a.y + b.y }
+  #{ x: a.x + b.x, y: a.y + b.y }
 }
 
 fn area(s: Shape) -> Int {
@@ -31,7 +31,7 @@ fn larger_area(s1: Shape, s2: Shape) -> Int = max(area(s1), area(s2));
 
 fn main() -> () {
   let circle = Circle(5);
-  let rect = Rect({ x: 3, y: 4 });
+  let rect = Rect(#{ x: 3, y: 4 });
   let result = larger_area(circle, rect);
   ();
 }

test/e2e/fixtures/row_polymorphism.affine

@@ -16,5 +16,5 @@ struct Point3D {
 fn getX(p: Point2D) -> Int = p.x;
 
 fn mk_point(x: Int, y: Int) -> Point2D {
-  { x: x, y: y }
+  #{ x: x, y: y }
 }

test/e2e/fixtures/titlescreen.affine

@@ -44,7 +44,7 @@ struct TitleModel {
 // ── init ─────────────────────────────────────────────────────────────────────
 
 fn title_init() -> TitleModel {
-  {
+  #{
     screen_w:    1280,
     screen_h:    720,
     bgm_playing: 0,
@@ -58,10 +58,10 @@ fn title_init() -> TitleModel {
 
 fn title_update(msg: TitleMsg, model: TitleModel) -> TitleModel {
   match msg {
-    NewGame  => { screen_w: model.screen_w, screen_h: model.screen_h, bgm_playing: model.bgm_playing, selected: "new_game" },
-    LoadGame => { screen_w: model.screen_w, screen_h: model.screen_h, bgm_playing: model.bgm_playing, selected: "load_game" },
-    Settings => { screen_w: model.screen_w, screen_h: model.screen_h, bgm_playing: model.bgm_playing, selected: "settings" },
-    Credits  => { screen_w: model.screen_w, screen_h: model.screen_h, bgm_playing: model.bgm_playing, selected: "credits" }
+    NewGame  => #{ screen_w: model.screen_w, screen_h: model.screen_h, bgm_playing: model.bgm_playing, selected: "new_game" },
+    LoadGame => #{ screen_w: model.screen_w, screen_h: model.screen_h, bgm_playing: model.bgm_playing, selected: "load_game" },
+    Settings => #{ screen_w: model.screen_w, screen_h: model.screen_h, bgm_playing: model.bgm_playing, selected: "settings" },
+    Credits  => #{ screen_w: model.screen_w, screen_h: model.screen_h, bgm_playing: model.bgm_playing, selected: "credits" }
   }
 }
 
@@ -84,7 +84,7 @@ fn title_subs(model: TitleModel) -> String {
 // ── main ──────────────────────────────────────────────────────────────────────
 
 fn main() -> () {
-  tea_run({
+  tea_run(#{
     init:          title_init,
     update:        title_update,
     view:          title_view,