V48 Gate 3 (specification-implementation): eradicate legacy terminal browser proofs; repoint browser-proof coverage to /deposits and /reads

The /terminal cockpit browser proofs are removed and the active browser-proof
coverage now proves the current product surfaces.

- Contracts: uapi/app/bitcode-browser-proof.ts and
  bitcode-browser-accessibility-responsive-proof.ts drop the `terminal` surface
  and add `deposits` (/deposits) + `reads` (/reads) surfaces with real testids
  (route-shell-deposit/deposits-pipelines-table/deposit-synthesis-telemetry,
  route-shell-read/reads-pipelines-table/reads-synthesized-packs); Auxillaries
  routes move /terminal?auxillary-open-to= -> /packs?auxillary-open-to=. The jest
  contract tests and the opt-in Playwright specs are repointed to match.
- Deleted the V29-era terminal-ux browser proof: terminal-ux-browser-proof.ts,
  terminalUxBrowserProof.test.tsx, commercial-mvp.terminal-ux.spec.ts. Removed
  from the Gate Quality jest step + jest.config allowlist + the test:e2e:terminal-ux
  script; renamed test:e2e:v32-browser-proof -> test:e2e:accessibility-responsive-proof;
  CI step names drop "Terminal".
- Frozen V39/V40 proofs that read the deleted files as evidence
  (v39-enterprise-reading-ux-state, v40-browser-e2e-visual-proof,
  v40-test-inventory-coverage-matrix) are era-pinned via a new
  packages/protocol/test/era-pinned-superseded-browser-proofs.js shim (skips WITH
  A REASON once the terminal-ux proof is absent; runs unchanged on V39/V40 canon).
  Era-pinned V29/V32 .mjs checkers + historical canon-promotion workflows keep
  their references (inert at the current pointer; deep removal is F8 scope).

Verified: uapi tsc 0; uapi jest 156 suites / 619 pass; protocol 237 tests,
193 pass, 0 fail, 44 skipped; no live/dangling refs to the deleted files.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: geraldarthurdavis