v0.3.0b5

Pre-release for active BLE latency and concurrency testing.

Changes:

• Serialize active BLE sessions per Aruba source using the configured active connection slot count.
• Release session slots reliably on failed, cancelled, and disconnected active operations.
• Skip characteristic discovery when cached or advertised service data is already enough for the client.
• Add debug timing logs for active Aruba actions, session-slot waits, and characteristic discovery waits.
• Expand active BLE client tests around failure cleanup, slot serialization, and discovery shortcuts.

Validation:

• 172 pytest tests passing.
• Current worktree privacy scan passed for known sensitive local values.