BrainPost 0.1.3

Review fixes

• Use the Obsidian request transport at the plugin boundary instead of a global fetch fallback.
• Keep plugin startup lifecycle methods void-compatible with the Obsidian API.
• Sanitize control characters without a flagged regular expression.

Verification

• Community review feedback addressed in commit afd6812.
• Release assets are main.js and manifest.json for version 0.1.3.
• GitHub artifact attestations verify the release subjects against the repository workflow.

Full changelog: 0.1.2...0.1.3