fix(v1.0.2): Array grow from 0, Map/Set rehash, checked div/mod

- Array_Push grows from cap 0 (same min as Insert) to avoid segfault
- Map/StringMap/Set: default min cap 8 and auto-rehash at ~50% load
- Integer / and % emit bux_div_i64 / bux_mod_i64 (panic instead of SIGFPE)
- Bump version to 1.0.2; stdlib golden regressions; fmt clean

docs/RELEASE_v1.0.2.md

@@ -0,0 +1,24 @@
+# Bux v1.0.2 — Patch
+
+**Date:** 2026-07-28  
+**Tag:** `v1.0.2`
+
+Patch release on the **v1.0 language freeze**. No language-surface breakage;
+stdlib + codegen correctness only.
+
+## Fixes
+
+| Area | Issue | Fix |
+|------|--------|-----|
+| `Array_Push` | `Array_New(0)` + push → segfault (`cap * 2 == 0`) | Grow to at least 4 when capacity was 0 (same as `Array_Insert`) |
+| `Map` / `StringMap` | Full table → infinite loop in open-addressing probe; `cap == 0` → SIGFPE on `%` | Default min cap 8; auto-rehash when load ≥ 50% |
+| `Set` | Same as Map | Same grow / min-cap policy |
+| Integer `/` and `%` | Divisor 0 → raw SIGFPE | Emit `bux_div_i64` / `bux_mod_i64` (bootstrap LIR + C backends, selfhost C backend) |
+
+## Verify
+
+```bash
+make build
+./buxc --version          # bux 1.0.2 (bootstrap)
+make test-stdlib test-examples
+```