Tags: Soydasm/mcpfang

feat: add Vertex + Bedrock providers, fix fuzzer timeouts & parallelism

  - Vertex AI provider (google-auth, service account JSON)
  - AWS Bedrock provider (boto3, default credential chain)
  - Remove unused streaming methods from all providers
  - Fuzzer: per-probe timeout (5s), parallel probes (concurrency 8),
    phase-level emergency brake (120s); slow/interactive tools auto-skipped
    dynamically via baseline timeout detection
  - Warn when mcpfang.yaml is not found in cwd

ci: add PyPI publish workflow with Trusted Publisher on tag push