fix: correct Linspace endpoint inclusion and update related tests

Author: arnog

CHANGELOG.md

@@ -150,6 +150,18 @@
   and ternary compilation behavior. No behavioral change — the rules
   were already implemented; only the description was incomplete.
 
+#### Fixed
+
+- **`Linspace` endpoint inclusion** — `Linspace(a, b, n)` now produces `n`
+  points evenly spanning `[a, b]` inclusive of both endpoints (matching NumPy,
+  Julia, and MATLAB convention). Previously the divisor was `n` instead of
+  `n - 1`, so the last sample fell short of `b` (e.g. `Linspace(0, 1, 5)`
+  yielded `0, 0.2, 0.4, 0.6, 0.8` instead of `0, 0.25, 0.5, 0.75, 1`). The
+  `at`, `iterator`, and `contains` handlers are all corrected. `Linspace(a, b,
+  1)` is the degenerate case and returns just `a`. The `contains` check is
+  also now tolerance-based (was an exact `%` test that failed for typical
+  floating-point values).
+
 #### Known issues
 
 - **JS `Loop` compile produces `undefined`** — the imperative `for`-loop IIFE

test/compute-engine/collections.test.ts

@@ -251,17 +251,17 @@ describe('DROP 2', () => {
     expect(evaluate(['Drop', linspace, 2])).toMatchInlineSnapshot(`
       [
         "List",
-        4.202247191011236,
-        5.3033707865168545,
-        6.404494382022472,
-        7.50561797752809,
-        8.606741573033709,
+        4.227272727272727,
+        5.340909090909091,
+        6.454545454545454,
+        7.568181818181818,
+        8.681818181818182,
         "ContinuationPlaceholder",
-        94.49438202247191,
-        95.59550561797752,
-        96.69662921348315,
-        97.79775280898876,
-        98.89887640449439
+        95.54545454545455,
+        96.6590909090909,
+        97.77272727272727,
+        98.88636363636364,
+        100
       ]
     `));
 
@@ -342,7 +342,7 @@ describe('SLICE (2,3)', () => {
 
   test('linspace', () =>
     expect(evaluate(['Slice', linspace, 2, 3])).toMatchInlineSnapshot(
-      `["List", 3.101123595505618, 4.202247191011236]`
+      `["List", 3.1136363636363633, 4.227272727272727]`
     ));
 
   test('tuple', () =>