docs: expand released Claude CLI native coverage matrix

[bingran-you]

Summary

• replace the earlier high-level leaf with a native 2.1.96 coverage matrix for released Claude CLI behavior
• separate provider-backed local paths from first-party account-bound flows
• capture the new parity-critical cases surfaced during full local testing, including maintenance lanes, trust/onboarding, plugin/MCP lifecycles, and session nuances

Verification

• native CLI 2.1.96 provider-backed local command and flag matrix exercised on this machine
• node dist/cli.js verify --tree-path ../claude-code/claude-code-context