fix: support anthropic stream requests

[cUp1d]

Related Issue

Fixes #46

Modification

• Switch ModelRunner from run_tools_async to stream_events_async for Anthropic stream compatibility.
• Only pass parallel_tool_calls=False for anthropic / vertexaianthropic models to avoid breaking non-Anthropic providers.
• Prioritize stream error handling before tool-followup decisions, so failed final events are not treated as successful tool continuation.
• Add regression tests for:
  • non-Anthropic path not receiving parallel_tool_calls
  • stream error taking precedence over tool follow-up
• Keep related tape-context stream compatibility updates and corresponding tests in this PR.
• Use ASCII status tags ([OK] / [ERROR]) in telegram_send.py for PowerShell-friendly output.

Tests

• Existing tests: uv run pytest passed
• Manual verification: covered by regression scenarios for Anthropic stream error + provider compatibility paths

Code Quality Checks

• uv run ruff check . passed
• uv run mypy passed