chore: prepare v0.9.1 release

release/release-notes.md

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+## Highlights
+### Changed
+- Release: Reduced packaged release size by excluding duplicate `extraResources` payload and pruning docs, tests, sourcemaps, and other source-only files from Electron bundles.
+
+### Fixed
+- Overlay: Restored controller navigation and lookup/mining controls while the subtitle sidebar is open, while keeping true modal dialogs blocking controller actions.
+- Tokenizer: Fixed subtitle annotation clearing so explanatory contrast endings like `んですけど` are excluded consistently across the shared tokenizer filter and annotation stage.
+
+## Installation
+
+See the README and docs/installation guide for full setup steps.
+
+## Assets
+
+- Linux: `SubMiner.AppImage`
+- macOS: `SubMiner-*.dmg` and `SubMiner-*.zip`
+- Optional extras: `subminer-assets.tar.gz` and the `subminer` launcher
+
+Note: the `subminer` wrapper script uses Bun (`#!/usr/bin/env bun`), so `bun` must be installed and on `PATH`.