chore(release): bump to v0.2.4

[DevVig]

Summary

Bump every product version source to 0.2.4 and add release notes for the
Homebrew signature-marker repair and DMG notarization hardening.

Why v0.2.4

v0.2.3 was never promoted from prerelease. During final public-install testing,
we reproduced macOS's damaged-app alert on the Homebrew path: the Formula wrote
an ownership marker inside the signed bundle and invalidated its resource seal.
PR #61 fixes that path, but the app binary must also ship its matching external
marker detection so Homebrew installations continue to use brew upgrade.

This patch release supersedes v0.2.3 rather than promoting a binary that does
not understand the corrected marker.

Changes

• Bump Rust workspace, Tauri app, npm package, bundle config, and lockfiles to
  0.2.4.
• Add docs/releases/v0.2.4.md with the blocker fix, distribution hardening,
  included product improvements, upgrade notes, and hardware-validation
  boundary.
• Leave the Formula at v0.2.3 until the v0.2.4 release workflow publishes and
  smoke-tests the exact public assets, then opens its generated Formula PR.

Verification

• make ci passed: 62 Rust tests, 4 Cursor hook tests, 9 UI tests, Clippy,
  formatting, and the production UI build.
• Root and Tauri Cargo checks passed at 0.2.4.
• All workspace package metadata, npm metadata, and Tauri bundle metadata report
  0.2.4.
• No configuration, protocol, or data migration is required.

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📥 Commits

Reviewing files that changed from the base of the PR and between 83d2b07 and dd16ad6.

⛔ Files ignored due to path filters (3)

• Cargo.lock is excluded by !**/*.lock
• apps/microbridge-ui/package-lock.json is excluded by !**/package-lock.json
• apps/microbridge-ui/src-tauri/Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (5)

• Cargo.toml
• apps/microbridge-ui/package.json
• apps/microbridge-ui/src-tauri/Cargo.toml
• apps/microbridge-ui/src-tauri/tauri.conf.json
• docs/releases/v0.2.4.md

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[Copilot]

Pull request overview

This PR prepares the v0.2.4 patch release by updating all product-facing version sources across the Rust workspace and Tauri/NPM UI app, and adding release notes documenting the Homebrew signature-marker repair and DMG notarization hardening.

Changes:

• Bump Rust workspace/package versions and lockfiles to 0.2.4.
• Bump Tauri app + NPM package versions (and lockfiles) to 0.2.4.
• Add docs/releases/v0.2.4.md release notes for the patch release.

Reviewed changes

Copilot reviewed 5 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
docs/releases/v0.2.4.md	Adds v0.2.4 release notes covering the Homebrew marker fix, distribution hardening, and upgrade notes.
Cargo.toml	Bumps workspace package version to 0.2.4.
Cargo.lock	Updates workspace crate versions to 0.2.4 in the lockfile.
apps/microbridge-ui/src-tauri/tauri.conf.json	Bumps the Tauri bundle/app version to 0.2.4.
apps/microbridge-ui/src-tauri/Cargo.toml	Bumps the Tauri Rust crate version to 0.2.4.
apps/microbridge-ui/src-tauri/Cargo.lock	Updates UI/Tauri lockfile entries consistent with the 0.2.4 bump.
apps/microbridge-ui/package.json	Bumps the UI NPM package version to 0.2.4.
apps/microbridge-ui/package-lock.json	Updates the NPM lockfile version fields to 0.2.4.

Files not reviewed (1)

• apps/microbridge-ui/package-lock.json: Generated file

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