Rewrite the fork roadmap for the TypeScript-only fork

[cstarlea]

Step 4 of the TS-only plan, and the last one. dev/FORK_ROADMAP.md still described upstream v1.0 with 29 languages. It's now rewritten for the TypeScript-only fork:

1. Where things stand: scope, accuracy work, how regressions are measured (golden fixtures plus the four real repos), CI, and a table of PRs M0: stop fixer damage and silent zeros; fix worst TypeScript false positives #1–Replace the language plugin registry with a direct TypeScript config #14.
2. What's next, in priority order:
   1. AST-based fixers, so the --unsafe gate can come off;
   2. detector accuracy, including the M0/M1 leftovers (#subpath imports, _NEXTJS_* → entry_conventions, multi-hop barrel coverage, @generated zoning);
   3. engine and state correctness (strict score, state quarantine, locks);
   4. new capabilities (tsc type errors, ESLint/Biome/oxlint, tsconfig health, more frameworks);
   5. engineering foundation;
   6. fork identity and release.
3. Dropped with TS-only: findings whose code is gone (CE-1, CE-13, CE-14, CE-17, GR-8, GR-10, PK-3, E8, AR-3, and the other languages).
4. Appendix: every original finding with a status (done, partial, open, gated or dropped) and a pointer to the item that covers it.

The golden expectation that cited "roadmap M1 1.1" now cites the new item number (2.14).

No code changes. Golden and CI-contract tests pass.

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