release: 0.1.5 (#134)

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

changelog/0.1.5/2026-07-29-offline-install-bundles.md

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+# Multi-platform offline installer bundles
+
+- Release builds now wrap each Windows, Linux and macOS platform archive with its checksum and native installer, producing five self-contained offline bundles.
+- `install.sh` and `install.ps1` can install a verified local Release archive without network access while preserving their existing online behavior.
+- POSIX offline bundles use a dedicated entry point that passes their payload explicitly, so the online installer never trusts archives discovered beside a temporary script.
+- Platform packages carry a target manifest, allowing explicit local archive paths to be renamed without relying on the filename for compatibility checks.
+- Windows offline bundles include `install.cmd` as a double-click entry point; Linux and macOS bundles keep `install.sh` executable.