Prepare the v0.4.6 desktop release note, bump the desktop package version, and refresh README/docs guidance for signed releases and updater validation.
Tested: bun run scripts/release.ts 0.4.6 --dry
Tested: bun test scripts/pr/release-workflow.test.ts scripts/release-update-metadata.test.ts scripts/quality-gate/package-smoke/index.test.ts
Tested: bun run check:policy
Tested: bun run check:docs
Not-tested: bun run verify; release prep was validated with docs and release-focused gates only.
Confidence: high
Scope-risk: narrow
Tested: bun test scripts/pr/release-workflow.test.ts scripts/release-update-metadata.test.ts scripts/quality-gate/package-smoke/index.test.ts
Tested: bun run check:policy
Tested: bun run check:docs
Tested: workflow YAML parse and git diff --check
Scope-risk: moderate
