feat(graveyard): add 5 more famous casualties

[mvanhorn]

Summary

Adds 5 new entries to both data sources that power the graveyard:

• `KNOWN_REPO_CAUSES` in `src/lib/scoring.ts`
• `HALL_OF_SHAME` in `src/components/Leaderboard.tsx`

All five are confirmed archived on GitHub (`archived: true` at time of PR). Causes are under ~65 characters and match the existing dry deadpan tone.

New entries

Repo	Cause	Death
`facebook/draft-js`	Meta shipped Lexical and forgot which editor anyone was using	Feb 2023
`LightTable/LightTable`	The IDE of the future stayed in the future permanently	Jun 2022
`keystonejs/keystone-classic`	Keystone 6 shipped and nobody looked back at the old one	Dec 2023
`facebookarchive/stetho`	Chrome DevTools got native Android debugging and stopped caring	Oct 2024
`facebookarchive/react-native-fbsdk`	Replaced by a package with -next in the name	Mar 2021

Why these five

• draft-js: Facebook explicitly deprecated it in favor of Lexical. Classic corporate-orphan story.
• LightTable: Kickstarter-funded Clojure IDE that alpha'd in 2014 and never hit 1.0. Archived in 2022.
• keystone-classic: The team renamed the modern rewrite to `@keystone-6/core`; the original repo is archived and publicly deprecated.
• stetho: Facebook's Chrome DevTools bridge for Android. Native Android debugging in Chrome made it redundant.
• react-native-fbsdk: Hard-archived by Meta in favor of `react-native-fbsdk-next`. Name of the successor is its own joke.

Test plan

• `npm run lint` passes (no ESLint warnings/errors)
• `npm test` passes (32/32)
• Each `fullName` verified via `gh api repos/` returning `archived: true`

Refs #9

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