chore: prepare v0.6.3 release

release/release-notes.md

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+## Highlights
+### Changed
+- Overlay: Expanded the `Alt+C` controller modal into an inline config/remap flow with preferred-controller saving and per-action learn mode for buttons, triggers, and stick directions.
+
+### Internal
+- Workflow: Hardened the `subminer-scrum-master` skill to explicitly answer whether docs updates and changelog fragments are required before handoff.
+- Release: Automate `subminer-bin` AUR package updates from the tagged release workflow.
+
+## 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`.