fix(update): preserve renamed binary identity

[shiny-code-bot]

Summary

• Preserve renamed binary command identity for update diagnostics and TUI upgrade prompts.
• Allow direct unmanaged /usr/local/bin binaries to self-update without sudo, while still refusing package-manager paths.
• Add the Every Code Lab runtime/build tag to diagnostics, the TUI header, issue reporting guidance, and the naming ledger.

Refs #238
Refs #239

Validation

• cargo test -p code-cli --bin code update
• cargo test -p code-tui updates::tests::upgrade_resolution
• git diff --check on touched files
• JetBrains inspection closeout: changed files, clean
• ./build-fast.sh