Later: rename umbrella to code-explainer (pr + repo modes)

[shilpi1958]

Summary

Rebrand package/CLI from pr-explainer to something like code-explainer with pr and repo subcommands. Keep pr-explainer as a thin alias for a while.

Out of scope for first repo-mode ship

Do after pr-explainer repo is stable.

Notes

• npm package, bin, ~/.pr-explainer → ~/.code-explainer migration
• GitHub Action / Product Hunt / Substack copy

Priority / difficulty

P2 · hard

[shilpi1958]

Shipped in #19 as @shilpi1958/code-explainer@3.0.0 with pr / repo modes and pr-explainer as a legacy alias. npm publish still needs to be run once you're logged in to the shilpi1958 scope.