v0.8.0 — E2E test suite + schema fixes + operational runbooks

E2E test infrastructure (reincarnation of #63 by @ecthelion77, Olivier Gintrand) plus three pre-existing schema bugs the suite surfaced on first run against GitLab CE 18.x. Also includes three operational runbooks (release atomicity recovery, ghcr first-publish, release ceremony) that close #47, #49, #51.

Added

• End-to-end test suite under e2e/ — 81 tests covering all 86 MCP tools
  against a real GitLab CE container. 76 pass + 5 Premium-only skipped on a
  fresh GitLab volume. Originally proposed in #63 by @ecthelion77; reincarnated
  by maintainer onto current main with corrections (see Internal below).
• .github/workflows/e2e.yml — runs the E2E suite after the build workflow
  completes, using a pre-warmed GitLab CE image.
• .github/workflows/warm-gitlab.yml — weekly pre-warm of a GitLab CE image
  with migrations already applied, cutting E2E boot time from 8-12 min cold to
  ~2 min. Manual workflow_dispatch available for ad-hoc rebuilds.
• scripts/check-tool-coverage.sh — coverage gate wired into build.yml
  that fails the build if a new tool is added to src/index.ts without a
  corresponding E2E test. Premium-only tools (group wiki) whitelisted.
• GITLAB_HOST_PORT env override in e2e/docker-compose.yml for local
  contributors whose host port 8080 is occupied by other services.

Fixed

• GitLabRepositorySchema now declares path_with_namespace and path —
  present in every /projects response from GitLab but Zod was silently
  stripping them, so tool consumers that relied on them (including the
  search_repositories E2E test) saw undefined. Pre-existing bug on main,
  surfaced by the reincarnated suite.
• approveMergeRequest / unapproveMergeRequest no longer parse responses
  as full MergeRequest objects — the /merge_requests/:iid/approve and
  /unapprove endpoints in GitLab CE return a small approval-state object,
  not the full MR. The old code threw Invalid arguments: id, iid, ... required
  on every call. New schema MergeRequestApprovalStateSchema parses both
  variants and tolerates the 204 No Content return from CE on unapprove.
• WikiPageFormatEnum accepts 'plaintext' — GitLab CE 18.x returns
  'plaintext' on wiki pages created via API without an explicit format,
  in addition to the 4 documented values. Enum was rejecting the response.

Internal

• Maintainer corrections applied during reincarnation of #63 — node:22-alpine
  digest pin in e2e/Dockerfile; gitlab/gitlab-ce:18.11.3-ce.0 pin in
  docker-compose (was :latest); external_url 'http://gitlab.local' (nominal
  hostname) so nginx listens on container port 80 matching the port mapping;
  monitoring_whitelist = ['0.0.0.0/0', '::/0'] so host-side
  wait-for-gitlab.sh can poll /-/readiness through the docker bridge;
  FIXTURES_DIR default changed from absolute /app/fixtures to relative
  ./fixtures so host runs work; ToolResult type narrowed from any to a
  shaped optional-content union; coverage-script regex tightened to .callTool(
  context to eliminate 5 false positives; .dockerignore added; warm-gitlab.yml
  permissions and :latest push gating hardened. Full per-commit detail on the
  reincarnation PR.

Documentation

• docs/OPERATIONS.md gained two operational runbooks:
  "Release atomicity & recovery" (closes #47) covering the independent
  failure modes of build.yml and publish.yml plus gh CLI recovery
  commands for each asymmetric case, and "First-publish runbook: ghcr.io
  package" (closes #51) covering the one-time visibility/Actions-access
  setup for a freshly created container package on GitHub.
• CONTRIBUTING.md gained a "🎯 Release ceremony" section (closes #49)
  documenting the release-driven publish model (since #43): when to cut a
  release, the 8-step maintainer procedure, and the anti-patterns (no
  manual npm publish, no amends to published releases, no CHANGELOG
  rewrites).
• CLAUDE.md test note refreshed to mention the new e2e/ suite +
  coverage gate, and to list all current unit test files.

Credits

• E2E suite design and ~80% of the implementation: @ecthelion77 (Olivier Gintrand).
  Cherry-picked with authorship preserved on each of his 5 commits; the squash
  merge to main carries a Co-authored-by: trailer.