docs: clarify Agent Trace install limitation

[NWYLZW]

Summary

• state explicitly that v0.1.1 is a documentation/source archive, not a CLI-installable artifact
• explain that the archive lacks the required cordisx-package.json manifest and cannot be fixed by a catalog entry alone
• retain the accurate future CLI syntax without claiming that version 0.1.1 supports it

No release asset is replaced and no runtime, protocol, capability, or packaging behavior changes.

Verification

• npm run format:check
• npm pack --dry-run
• git diff --check