pi-v0.4.1

## Changes
- Ship the merged correction reserving session summaries for explicit closure (#1771).
- Align the package, compatibility diagnostic, and current installation guidance on 0.4.1.
- Upgrade previous 0.4.0 pins idempotently while preserving unrelated Pi settings and MCP configuration.

## Install
```sh
pi install npm:gentle-engram@0.4.1
pi-engram init
```
Restart Pi after installation.

## Publication verification
- Published npm version and latest dist-tag: 0.4.1.
- Source commit: 1955eefd36590e2e6ae82e46729782dbaf303e40 (PR #1778).
- Public tarball integrity and source provenance checked; [npm provenance](https://registry.npmjs.org/-/npm/v1/attestations/gentle-engram@0.4.1).
- Existing required CI, focused installer/release contracts, independent verification and native review passed before publication.