Ava orchestrator improvements

Child Tasks

• t-298.6 - Document Ava orchestrator setup and dependencies [Done]
• t-297 - Reviewer should add comments to task for coder feedback [Done]
• t-298.1 - Create Ava environment wrapper script [Done]
• t-298.5 - Coder should run bild itself before declaring success [Done]
• t-298.8 - Add orchestrator timeout and resource limits [Done]
• t-298.3 - Handle orchestrator spawn failures gracefully [Done]
• t-298.4 - Fix git hooks for Ava user [Done]
• t-298.7 - Consider native Anthropic API instead of OpenRouter [Done]
• t-298.2 - Stream orchestrator progress to Telegram [Done]