Distinguish local provider readiness failures from target-support refusals in shared CLI/MCP diagnostics, preserving original codes and evidence. Avoid claiming configured providers are unconfigured.
120 focused tests, static/docs checks and real ELF CLI/MCP verification pass. Hosted CI has the same four ADB failures as exact main d9908fd7a; three canceled shards remain unverified. Merge uses the user's explicit authorization to bypass proven main failures. Fresh Codex and Greptile reviews are clear.
Fixes#7214
Co-authored-by: gensokyo-dev <342580529+gensokyo-dev@users.noreply.github.com>
