BrowserOS Agent Extension - v0.0.153.0

• fix: restore original agent starter prompt defaults (#2612) (2c8b903)
• feat: add diagnostics pages and share snapshots with Reporter (#2607) (33b08a9)
• feat: customize chat starter prompts inline (#2608) (cb89c4d)
• chore: simplify usage and billing guidance (#2606) (1c0c241)
• chore: remove MCP setup banner from AI settings (#2605) (dc4923e)
• fix: preserve per-tab side panel behavior (#2604) (39230a3)
• chore: bump agent extension version to 0.0.152.0 (#2594) (223324c)