v3.6.0

This release introduces configurable AI service tier support for subtitle generation and lyrics research models, enabling flexible execution across auto, default, flex, and priority tiers.

New Features & Improvements:

• AI Service Tier Configuration:
  • Added ServiceTier type definition (Literal["auto", "default", "flex", "priority"]) exported in src/ai_sub/__init__.py.
  • Added CLI and configuration settings (--ai.service-tier, --ai.service-tier-subtitles, --ai.service-tier-lyrics) in src/ai_sub/config.py and documented in docs/CONFIGURATION.md.
  • Updated AiSettings.validate_models validator to propagate global --ai.service-tier shorthand to subtitle and lyrics tier settings.
  • Integrated service tier settings into RateLimitedAgentWrapper for both Google models (GoogleModelSettings at src/ai_sub/agent_wrapper.py) and non-Google models (ModelSettings at src/ai_sub/agent_wrapper.py).
  • Passed service_tier_subtitles and service_tier_lyrics during pipeline agent initialization in src/ai_sub/main.py.
• Project Maintenance & Chores:
  • Added .repomixignore to exclude showcase and release notes from repomix packing and updated .gitignore to ignore repomix-output.xml.