[shuv1337]

Summary

• Prepare 2.2.6-shuv.3 with user-facing release notes for fix: resolve worktree and Evaluation follow-ups #480 and fix(config): surface configuration errors in TUI and CLI #481.
• Bump the CLI manifest and its workspace lockfile entry, following chore(sync): merge upstream dev for 2.2.6-shuv.2 #479. Root and internal workspace versions remain at upstream 2.2.6, as in 2.2.6-shuv.2.
• Reuse the existing packages/script/src/version.ts release-floor logic: the CLI manifest supplies the minimum; no script implementation change is needed.
• No feature flag: release metadata and documentation only. Do not merge or publish as part of this task.

Verification

• bun install --frozen-lockfile: passed.
• bun run check: passed, 39/39 typecheck tasks.
• packages/script bun test: 22 passed, 12 skipped (jj unavailable), 0 failed; includes version tests.
• Verified nextForkVersion resolves 2.2.6-shuv.3 with no published version, an older upstream base, and published 2.2.6-shuv.2.
• Touched-file Prettier and git diff --check: passed.