Replace O(n log n) sort_by with O(n) partition for sourcemap chain processing. Since only two variants exist (Load/Transform), we can:

1. Partition elements into Load and Transform vectors in O(n) time
2. Sort only Transform elements by plugin order
3. Reconstruct with Load elements first, then sorted Transform elements

This removes unnecessary O(n log n) work and is faster on transform-heavy projects. Pre-allocated vectors reduce allocations.

Addresses performance hint /performance/2

## [1.0.0-beta.48] - 2025-11-10

:boom: Breaking Changes

- `this.emitFile` now respects `chunkFileNames` for chunk type
```js
// rolldown.config.js
export default {
  output: {
    chunkFileNames: 'chunks/[name]-[hash].js'
  }
}

// In plugin
this.emitFile({
  type: 'chunk',
  id: './my-module.js'
});

// Before: Output might not follow chunkFileNames pattern
// After: Output follows 'chunks/[name]-[hash].js' pattern
```

- Deprecated top-level options removed
  - `define` → `transform.define`
  - `inject` → `transform.inject`
  - `dropLabels` → `transform.dropLabels`
  - `keepNames` → `output.keepNames`
  - `profilerNames` → `output.generatedCode.profilerNames`

- Stable plugins moved from experimental
```js
// Before
import { replacePlugin, esmExternalRequirePlugin } from 'rolldown/experimental';

// After
import { replacePlugin, esmExternalRequirePlugin } from 'rolldown/plugins';
```

- `RolldownBuild#scan` is removed, now only available from `rolldown/experimental`
```js
// Before: scan was a method on RolldownBuild
const build = await rolldown(config);
await build.scan();

// After: import scan from rolldown/experimental
import { scan } from 'rolldown/experimental';
await scan(config);
```

### 💥 BREAKING CHANGES

- `this.emitFile` does not respect `chunkFileNames` (#6868) by @Copilot
- remove deprecated top-level `dropLabels` option (#6915) by @sapphi-red
- remove deprecated top-level `keepNames` option (#6914) by @sapphi-red
- remove deprecated top-level `profilerNames` option (#6913) by @sapphi-red
- remove deprecated top-level `define` and `inject` options (#6912) by @sapphi-red
- move stable plugins from experimental to `rolldown/plugins` (#6303) by @shulaoda
- node: remove experimental `RolldownBuild#scan`, only expose it from `rolldown/experimental` (#6889) by @hyf0

### 🚀 Features

- add side-effect detection for global constructors with primitive arguments (#6898) by @IWANABETHATGUY
- rust: use `BundleMode` to handle incremental build exhaustively (#6894) by @hyf0
- detect side-effect-free global function calls (#6897) by @IWANABETHATGUY
- expose `parseSync` / `parseAsync` function (#6866) by @sapphi-red
- skip `__toESM` helper when only named imports are used from CJS modules (#6850) by @Copilot
- rolldown_binding: expose `htmlInlineProxyPlugin` (#6856) by @shulaoda
- rolldown_plugin_html_inline_proxy: align `load` hook logic (#6855) by @shulaoda
- rolldown_plugin_html_inline_proxy: align `resolveId` hook logic (#6854) by @shulaoda
- rolldown_plugin_html_inline_proxy: initialize (#6853) by @shulaoda

### 🐛 Bug Fixes

- cli: support nested options in CLI properly (#6911) by @sapphi-red
- debug: ensure injecting `hook_resolve_id_trigger` correctly (#6908) by @hyf0
- use chunk-specific exports for entry module export detection (#6904) by @IWANABETHATGUY
- debug: ensure build get injected and add tests (#6896) by @hyf0
- error: return friendly error for bundler already closed scenario (#6878) by @hyf0
- improve dynamic entry processing with iterative approach (#6869) by @IWANABETHATGUY
- handle tsconfig option resolve error (#6871) by @sapphi-red
- handle error when creating output chunk directories (#6870) by @sapphi-red
- node: `NormalizedOutputOptionsImpl` and `NormalizedInputOptionsImpl` enumerable (#6861) by @hyf0
- node: keys of `RolldownOutput` should be enumerable (#6852) by @Copilot

### 🚜 Refactor

- rust: rename `BundleContext` to `BundleHandle` (#6893) by @hyf0
- rust: rename `build_span` to `bundle_span` (#6892) by @hyf0
- rust: introduce `PluginDriverFactory` to manage creation of `PluginDriver` (#6891) by @hyf0
- crates/rolldown_binding: remove useless `BindingBundlerImpl` (#6888) by @hyf0
- crates/rolldown_binding: rename `Bundler` to `ClassicBundler` and clarify the purpose (#6887) by @hyf0
- rust: rename `BuildFactory/Build` to `BundleFactory/Bundle` (#6886) by @hyf0
- rust: tweak incremental build related methods of `Bundler` (#6884) by @hyf0
- rust: manage build via `BuildFactory` for `Bundler` (#6883) by @hyf0
- node: implement a new `Bundler` that satisfy the usage of `RolldownBuild` (#6877) by @hyf0
- node: remove useless `nonEnumerable` decorator (#6862) by @hyf0

### 📚 Documentation

- add documentation for native replace plugin (#6315) by @shulaoda
- in-depth/directives: expand description of how directives are handled (#6882) by @sapphi-red
- in-depth/bundling-cjs: clarify the condition of `default` export interop (#6875) by @sapphi-red
- add troubleshooting section for `this` in exported functions (#6865) by @sapphi-red
- update prebuilt binaries list based on Node 24 platform support tier (#6864) by @sapphi-red
- remove unsupported [ext] placeholder from entryFileNames and chunkFileNames (#6859) by @Copilot

### ⚡ Performance

- rolldown: improve sourcemap chain processing (#6858) by @Brooooooklyn

### 🧪 Testing

- add test case for issue #6881 with scientific notation (#6906) by @IWANABETHATGUY

### ⚙️ Miscellaneous Tasks

- deps: update npm packages (#6918) by @renovate[bot]
- deps: update dependency rolldown-plugin-dts to v0.17.5 (#6917) by @renovate[bot]
- deps: lock file maintenance (#6907) by @renovate[bot]
- deps: update rust crates (#6905) by @renovate[bot]
- deps: update npm packages (#6903) by @renovate[bot]
- deps: update github-actions (#6902) by @renovate[bot]
- deps: update `oxc_resolver` and `oxc_resolver_napi` (#6901) by @shulaoda
- deps: update dependency rolldown-plugin-dts to v0.17.4 (#6895) by @renovate[bot]
- deps: update dependency tsdown to v0.16.1 (#6885) by @renovate[bot]
- deps: upgrade napi to remove linker args that skip missing symbols (#6867) by @Boshen

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