docs: document new features from v1.3.2 and v1.3.3 (#24932)

## What does this PR do?

Adds missing documentation for features introduced in Bun v1.3.2 and
v1.3.3:

- **Standalone executable config flags**
(`docs/bundler/executables.mdx`): Document
`--no-compile-autoload-dotenv` and `--no-compile-autoload-bunfig` flags
that control automatic config file loading in compiled binaries
- **Test retry/repeats** (`docs/test/writing-tests.mdx`): Document the
`retry` and `repeats` test options for handling flaky tests
- **Disable env file loading**
(`docs/runtime/environment-variables.mdx`): Document `--no-env-file`
flag and `env = false` bunfig option

## How did you verify your code works?

- [x] Verified documentation is accurate against source code
implementation in `src/cli/Arguments.zig`
- [x] Verified features are not already documented elsewhere
- [x] Cross-referenced with v1.3.2 and v1.3.3 release notes

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>

docs/bundler/executables.mdx

@@ -183,6 +183,35 @@ console.log(process.execArgv); // ["--smol", "--user-agent=MyBot"]
 
 ---
 
+## Disabling automatic config loading
+
+By default, standalone executables look for `.env` and `bunfig.toml` files in the directory where the executable is run. You can disable this behavior at build time for deterministic execution regardless of the user's working directory.
+
+```bash icon="terminal" terminal
+# Disable .env loading
+bun build --compile --no-compile-autoload-dotenv ./app.ts --outfile myapp
+
+# Disable bunfig.toml loading
+bun build --compile --no-compile-autoload-bunfig ./app.ts --outfile myapp
+
+# Disable both
+bun build --compile --no-compile-autoload-dotenv --no-compile-autoload-bunfig ./app.ts --outfile myapp
+```
+
+You can also configure this via the JavaScript API:
+
+```ts
+await Bun.build({
+  entrypoints: ["./app.ts"],
+  compile: {
+    autoloadDotenv: false, // Disable .env loading
+    autoloadBunfig: false, // Disable bunfig.toml loading
+  },
+});
+```
+
+---
+
 ## Act as the Bun CLI
 
 <Note>New in Bun v1.2.16</Note>