docs: add release notes and media directory for v0.5.4

LiveReview Pre-Commit Check: vouched (iter:1, coverage:0%)

Author: LinceMathew

docs/releases/img/v0.5.4/README.md

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+# Release media for v0.5.4
+
+Drop screenshots, GIFs, and any local video files for this release into this directory.
+
+Use markdown references like: ![demo](IMG:demo.png)
+For a manual video follow-up, keep this inside an HTML comment in the release notes: <!-- VIDEO:demo.mp4 -->
+
+Raw URL base after publish:
+https://raw.githubusercontent.com/HexmosTech/git-lrc/refs/heads/main/docs/releases/img/v0.5.4/

docs/releases/v0.5.4.md

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+# Release v0.5.4
+
+Date: 2026-07-02
+
+## Summary
+- Replaces the single "Send to Claude" button in the review UI with a multi-agent "Send to" split button + dropdown, and redesigns the handoff confirmation modal.
+- Demo video: https://youtu.be/DV2qt28TMmo
+
+## Install and Update
+New install:
+```
+# Linux/macOS
+curl -L https://hexmos.com/ipm-install | bash && ipm i HexmosTech/git-lrc
+
+# Windows
+iwr https://hexmos.com/ipm-install-ps | iex; ipm i HexmosTech/git-lrc
+```
+
+Update:
+
+```
+lrc self-update
+```
+
+## Changes
+- List the most important user-facing changes.
+
+## Breaking Changes
+- None.
+
+## Verification
+- lrc --version
+- lrc --help
+
+## Known Issues
+- None.