…9899)

## What

`ConflictResolver::resolve` is the per-symbol deconfliction primitive (shared by `Renamer` and the cross-chunk export pass) — called once for every top-level symbol in every chunk.

Its fast path (the common case where the bare name is free) hashed and walked the `used` map **twice** for the same key:

```rust
if !self.used.contains_key(&base) && accept(&base, true) {
  self.used.insert(base.clone(), 0);   // second hash + table walk of `base`
  return base;
}
```

This replaces the `contains_key` + `insert` pair with a single `entry()` probe. Semantics are identical:

- `Vacant` + accepted → the old fast path (write the slot we already located)
- `Vacant` + vetoed → leave `base` unrecorded, start the suffix search at 1
- `Occupied` → jump past it using its stored counter

The clone count is unchanged (the map must own the key either way); the win is **one fewer hash + table walk per symbol** on the hot path.

## Evidence (cargo-asm, release / fat-LTO)

Measured on the inlined caller `Renamer::add_symbol_in_root_scope`:

| | asm lines | `contains_key` | `insert` |
|---|---|---|---|
| before | 927 | 1 | 4 |
| after | 783 | 0 | 3 |

## Verification

- `ConflictResolver` unit tests (incl. the counter-jump / veto edge cases) pass
- `topics/deconflict` integration snapshots pass **byte-identically**
- clippy clean

Companion of #9900, which applies the same single-probe pattern to the `canonical_names` dedup in `add_symbol_in_root_scope`. The two are independent (disjoint files) and can land in either order.

## [1.1.3] - 2026-06-24

### 🐛 Bug Fixes

- `defer_drop` crashes the browser main thread (#9942) by @shulaoda
- camel-case: correct camel case for nested values (#9933) by @kb019
- cli: display --help options in camelCase (#9941) by @IWANABETHATGUY
- preserve used re-exports under preserveModules (#9122) (#9934) by @IWANABETHATGUY
- watch: make close reentrant in event callbacks (#9904) by @hyf0
- git for windows treats symlink files as regular files (#9915) by @AliceLanniste
- dev: cancel pending full reload on build error (#9903) by @h-a-n-a
- chunking: pass plugin meta to codeSplitting groups name function (#9267) by @Kyujenius
- dev: serve assets emitted during HMR/lazy compile (vite#22596) (#9815) by @h-a-n-a
- release: dry-run step no longer publishes binding packages (#9866) by @Boshen

### 🚜 Refactor

- rolldown_common: model ModuleId as a classified Path/Virtual/Bare enum (#9927) by @Boshen
- remove unused LegacyModuleIdx (#9872) by @shulaoda
- remove unused StmtInfos::get_namespace_stmt_info (#9870) by @shulaoda
- remove unused Module::as_external_mut (#9871) by @shulaoda
- remove unused EcmaAst::is_body_empty (#9869) by @shulaoda
- drop dead is_css_module handling in resolve_dependencies (#9867) by @shulaoda
- drop redundant with_commonjs on cjs source type (#9868) by @shulaoda

### 📚 Documentation

- clarify on drafting PRs (#9952) by @h-a-n-a
- update contribution guidelines (#9944) by @fubhy
- note Rust crates don't follow semver in AGENTS.md (#9905) by @IWANABETHATGUY
- add feedback form (#9159) by @TheAlexLichter

### ⚡ Performance

- utils: avoid allocation in default_sanitize_file_name for clean names (#9928) by @Boshen
- binding: box once-per-build futures before spawn_future (#9864) by @Boshen
- utils: avoid wasted allocation in legitimize_identifier_name (#9926) by @Boshen
- rolldown: fuse the canonical-name dedup and insert in the renamer (#9900) by @Boshen
- rolldown: probe the name map once in ConflictResolver::resolve (#9899) by @Boshen
- cut two heap allocations from wrapped ESM init finalize (#9901) by @Boshen
- rolldown_plugin_vite_reporter: hoist invariant out_dir prefix out of reporter loop (#9873) by @shulaoda
- drop throwaway Vec in wrapped esm init stmt (#9878) by @shulaoda
- borrow owner_filename in build-import-analysis AddDeps (#9874) by @shulaoda

### 🧪 Testing

- cover preserveModules named export via namespace re-export (#6010) (#9937) by @IWANABETHATGUY

### ⚙️ Miscellaneous Tasks

- deps: update napi to v3.9.4 (#9954) by @shulaoda
- reduce noise from CODEOWNERS for trival changes (#9953) by @h-a-n-a
- deps: update mimalloc-safe to 0.1.64 (#9950) by @shulaoda
- deps: update rollup submodule for tests to v4.62.2 (#9931) by @rolldown-guard[bot]
- deps: test mimalloc-safe upstream-mimalloc switch in CI (#9930) by @shulaoda
- rolldown_plugin_vite_build_import_analysis: remove unused v2 code path (#9917) by @shulaoda
- rolldown_plugin_vite_manifest: remove unused is_enable_v2 code path (#9916) by @shulaoda
- rolldown_plugin_vite_asset_import_meta_url: remove unexposed native vite plugin (#9896) by @shulaoda
- rolldown_plugin_vite_asset: remove unexposed native vite plugin (#9895) by @shulaoda
- rolldown_plugin_vite_css_post: remove unexposed native vite plugin (#9894) by @shulaoda
- rolldown_plugin_vite_css: remove unexposed native vite plugin (#9893) by @shulaoda
- rolldown_plugin_vite_html_inline_proxy: remove unexposed native vite plugin (#9892) by @shulaoda
- rolldown_plugin_vite_html: remove unexposed native vite plugin (#9891) by @shulaoda
- deps: update github actions (#9909) by @renovate[bot]
- deps: update rust crate oxc_sourcemap to v8.0.2 (#9910) by @renovate[bot]
- deps: update npm packages (#9912) by @renovate[bot]
- deps: update github actions to v7 (#9913) by @renovate[bot]
- deps: update rolldown-plugin-dts to ^0.26.0 (#9897) by @renovate[bot]
- remove rolldown_filter_analyzer crate (#9865) by @Boshen

### ❤️ New Contributors

* @fubhy made their first contribution in [#9944](#9944)

Co-authored-by: shulaoda <165626830+shulaoda@users.noreply.github.com>