chore: release v1.10.0

[avoidwork]

Description

Release v1.10.0 — Minor version bump driven by TUI streaming performance optimization and architectural improvements across the codebase. Includes refactored streaming pipeline, enhanced markdown rendering, and comprehensive test coverage updates.

Type of Change

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactor (no functional change)
• Performance improvement
• CI / build / tooling

Testing

• Unit tests updated and passing (1129 tests, 100% line coverage)
• TUI streaming performance regression tests added
• Changelog generated via auto-changelog against 9 commits since v1.9.0

Coverage

• 100% line coverage maintained

Checklist

• npm run lint passes
• Tests pass with 100% line coverage
• No forbidden patterns used
• Conventional Commit style applied