test(aiograpi): live e2e for /info + CI live-test job

[subzeroid]

Summary

Adds the first true end-to-end live test for the aiograpi backend: from the
real CLI entrypoint all the way to a rendered /info profile. Closes the gap
left by the existing SDK-level audits, and wires it into CI behind a repo
secret.

Follows up #45 — the e2e exercises the TOTP login fix against live accounts.

What's new

• tests/live/aiograpi_info_e2e.py — spawns insto @instagram -c info --json -
  for a pooled TEST_ACCOUNTS_URL account (full aiograpi login incl. TOTP) and
  asserts the JSON envelope (data.profile.username == "instagram",
  pk == "25025320"). Reuses each account's client_settings as a seeded
  session and only honours an explicit IG_PROXY (pooled account proxies are
  unreliable — AuthRequiredProxyError: 302 on CONNECT). Skips clean (exit 0)
  when the secret is unset.
• tests/test_aiograpi_info_e2e.py — offline unit coverage for the pure
  helpers (skip-clean path, TOTP extraction from top-level/client_settings,
  subprocess-env wiring, session seeding, secret redaction). No network.
• .github/workflows/ci.yml — new live-test job + workflow_dispatch
  trigger. Runs on push/dispatch to subzeroid/insto only (forks/PRs never get
  the secret), gated on secrets.TEST_ACCOUNTS_URL.

Verification

• Offline: ruff / ruff format / mypy insto clean; pytest --cov → 925
  passed, 82.37% coverage.
• Live (local): ran the script against real pooled accounts —
  account[1] info: ok (username=instagram pk=25025320) → PASS, exit 0.
• TEST_ACCOUNTS_URL secret configured on the repo; the live-test job runs
  on merge to main.

Note: CLAUDE.md is gitignored in this repo, so its "Live-smoke procedure"
update stays local.

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