feat(npm): publish as codewhale; keep deepseek-tui as deprecation shim

Rename the npm wrapper directory and package from `deepseek-tui` to
`codewhale`. Move under `npm/codewhale/`:
  - `package.json` renamed (name, bin, internal field) — keeps a
    `deepseekBinaryVersion` fallback so old metadata still works.
  - Bin entry points renamed to `bin/codewhale.js` and
    `bin/codewhale-tui.js`; they spawn the corresponding canonical
    binaries via the wrapper.
  - `scripts/artifacts.js` switches to the canonical asset-name matrix
    (`codewhale-*`, `codewhale-tui-*`) and `codewhale-artifacts-sha256.txt`.
  - `scripts/run.js` exports `runCodewhale` and `runCodewhaleTui`; the
    legacy `runDeepseek` exports are gone since nothing else inside the
    package depended on them.
  - `scripts/install.js`, `verify-release-assets.js`, `preflight-glibc.js`
    update brand-mention strings + User-Agent headers. Env vars
    (`DEEPSEEK_TUI_*`, `DEEPSEEK_*`) are explicitly anti-scope and are
    left in place.
  - Tests retargeted at the canonical asset names; all 19 still pass.
  - README rewritten with the new install command and a deprecation
    note about the old package.

Create a one-release deprecation shim at `npm/deepseek-tui/`:
  - `package.json` with no `bin`, just a postinstall script that
    prints a clear message telling the user to install `codewhale`
    instead.
  - `README.md` with the same migration note.
  - Will be removed in v0.9.0 (or whenever Hunter retires the shims).

Release-side scripts in `scripts/release/` follow the rename:
  - `prepare-local-release-assets.js` now requires `npm/codewhale/...`
    and copies the canonical `codewhale*` binaries.
  - `npm-wrapper-smoke.js` smokes the renamed package.
  - `check-versions.sh` reads `npm/codewhale/package.json` for the
    primary check and additionally pins the legacy shim package to
    the same version.
  - `check-published.sh` queries `codewhale@<version>` (with
    `codewhaleBinaryVersion` lookup that falls back to the legacy
    `deepseekBinaryVersion` field).
  - `.github/workflows/auto-tag.yml` watches both `npm/codewhale/` and
    `npm/deepseek-tui/` package.json for auto-tag triggers.

Verified:
  - `npm test` inside `npm/codewhale/` passes 19/19.
  - `npm install --dry-run --ignore-scripts` succeeds for both
    `npm/codewhale/` and `npm/deepseek-tui/`.
  - `scripts/release/check-versions.sh` reports OK.
  - Rust gates re-run: `cargo check`, `cargo fmt --check`,
    `cargo clippy -- -D warnings`, all clean.

No `npm publish` is run from this change — Hunter publishes manually
when the rebrand is ready to ship.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scripts/release/check-versions.sh

@@ -5,10 +5,10 @@
 # Checks performed:
 #   1. No `crates/*/Cargo.toml` carries a literal `version = "x.y.z"`; every
 #      crate must inherit `version.workspace = true`.
-#   2. `npm/deepseek-tui/package.json` `version` matches the workspace
-#      `version` in the root `Cargo.toml`. (The npm wrapper directory is
-#      renamed to `npm/codewhale/` in a follow-up phase; this script will
-#      be updated then.)
+#   2. `npm/codewhale/package.json` `version` matches the workspace
+#      `version` in the root `Cargo.toml`. (`npm/deepseek-tui/` still
+#      exists during the transition as a deprecation shim package; its
+#      version is also checked.)
 #   3. Internal `codewhale-*` path dependency pins match the workspace version.
 #   4. The TUI crate's packaged changelog copy matches root `CHANGELOG.md`.
 #   5. The current release has a dated Keep a Changelog entry and compare link.
@@ -32,11 +32,20 @@ fi
 
 # 2) Workspace ↔ npm package.json.
 workspace_version="$(grep -E '^version = "' Cargo.toml | head -n1 | sed -E 's/^version = "([^"]+)".*/\1/')"
-npm_version="$(node -p "require('./npm/deepseek-tui/package.json').version")"
+npm_version="$(node -p "require('./npm/codewhale/package.json').version")"
 if [[ "${workspace_version}" != "${npm_version}" ]]; then
-  echo "::error::npm/deepseek-tui/package.json version (${npm_version}) does not match workspace Cargo.toml (${workspace_version})." >&2
+  echo "::error::npm/codewhale/package.json version (${npm_version}) does not match workspace Cargo.toml (${workspace_version})." >&2
   fail=1
 fi
+# Also pin the legacy deprecation shim package to the same workspace version
+# so a stale `deepseek-tui` doesn't ship pointing at a different release.
+if [[ -f npm/deepseek-tui/package.json ]]; then
+  legacy_npm_version="$(node -p "require('./npm/deepseek-tui/package.json').version")"
+  if [[ "${workspace_version}" != "${legacy_npm_version}" ]]; then
+    echo "::error::npm/deepseek-tui/package.json version (${legacy_npm_version}) does not match workspace Cargo.toml (${workspace_version})." >&2
+    fail=1
+  fi
+fi
 
 # 3) Internal path dependency pins.
 internal_dep_drift="$(