Add @wraith-protocol/codemod package for v1 migrations (#178)

[Jerryvic911]

Closes #178

Summary

New workspace package packages/codemod/ with a CLI
(npx @wraith-protocol/codemod v1 <path>) built on jscodeshift, plus
a programmatic API (runCodemod()).

Transforms (transforms/v1/)

One transform per breaking change currently documented in
MIGRATING.md:

• typed-error-catch.cjs — rewrites
  catch (e) { if (e.message.includes(...)) } message-matching into
  e instanceof <TypedError> checks, against a table of known message
  fragments sourced directly from src/errors.ts, and merges in the
  required import from @wraith-protocol/sdk.
• install-react-native-polyfills.cjs — inserts the required
  installReactNativePolyfills() call and import into React Native
  entry files that need it.

Both are conservative: only recognized patterns are rewritten, and
anything ambiguous is left untouched.

Testing

• Each transform has a fixture pre/post pair under fixtures/, plus a
  shared no-op-file fixture confirming non-matching code is left
  alone.
• Snapshot-style vitest tests cover each transform in isolation.
• An end-to-end test runs the same jscodeshift Runner the CLI uses,
  against a temp fixture app directory.
• Idempotency is verified at both the unit level (re-running a
  transform against its own output) and end-to-end (a full second CLI
  pass over the fixture app produces zero changes).
• pnpm test, pnpm typecheck, and pnpm build all pass locally.

Docs

Documented in MIGRATING.md, above the existing manual per-change
instructions, with usage and a note on what the codemod does and
doesn't cover.

Notes

• MIGRATING.md currently documents these two breaking changes under
  "Upgrading to 2.0.0," not a literal "v0.x → v1.0" section, and
  doesn't contain an "import path move" or "Announcement shape drift"
  breaking change (mentioned in the issue's context). I built
  transforms against what's actually documented and mechanically
  automatable — happy to add more if there's a change I'm missing.
• pnpm-lock.yaml is updated for the new package's dependencies
  (jscodeshift, tsup, vitest, etc.) — 124 pure additions, no changes
  to existing entries.

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[truthixify]

Merged. Idempotency verified by a second pass being a no-op, and a pre/post fixture per transform, which is what stops codemods rotting silently. Nice work @Jerryvic911.