feat: GitLab MR support and per-user analysis pipeline

[urishalit]

Summary

Adds end-to-end support for analyzing GitLab merge requests (including self-hosted instances) alongside existing GitHub PR support, plus a personal per-user analysis script kept outside the package. The CLI auto-detects the provider from the URL and routes to the appropriate API client.

What's new

GitLab merge request support (6ed2262, 1c71acf)

• cli/gitlab.py — full GitLab API client: fetch_mr, fetch_mr_with_rotation, diff pagination, normalization to the GitHub-style file dict shape consumed by preprocess.py.
• cli/main.py — analyze-pr, batch-analyze, and label-pr now accept GitLab MR URLs. Provider is detected via parse_mr_url (cli/utils.py).
• cli/config.py — get_gitlab_token / get_gitlab_tokens, with GL_TOKEN / GL_TOKENS aliases for consistency with the GitHub equivalents.
• cli/errors.py — ErrorHandler.handle_gitlab_404 and handle_gitlab_error mirror the GitHub handlers.
• Domain warning when using a non-standard GitLab instance (token-leak safety).
• Input validation on project_path and mr_iid.
• Rate-limit handling honors Retry-After.
• Labeling is gracefully skipped for GitLab MRs (GitLab labels are scoped to projects, not MRs in this codebase).

Self-hosted GitLab quirks

• --no-verify-ssl flag on batch-analyze (and a SSL_NO_VERIFY env var, threaded through every httpx.Client via a new cli/utils.ssl_verify_enabled() helper).
• GITLAB_DIFFS_PER_PAGE = 20 constant — git.datik.io returns HTTP 500 when /api/v4/projects/:id/merge_requests/:iid/diffs is requested with per_page > 20. Other endpoints keep per_page = 100.

Tests (ffca5b9)

• tests/test_gitlab.py — headers, validation, diff parsing, pagination (single page / multi-page / empty page / full-then-empty), single-fetch optimization, token rotation, error handling.
• tests/test_utils.py — parse_mr_url across GitHub / GitLab.com / self-hosted GitLab URL shapes.
• tests/test_config.py — get_gitlab_token / get_gitlab_tokens precedence and GL_* aliases.
• tests/test_errors.py — handle_gitlab_404 / handle_gitlab_error.
• tests/test_batch.py — mixed-provider batches, label skipping for GitLab URLs.

Personal analysis scripts kept out of the package (8a49719, b63abeb)

• 8a49719 originally added analyze_user.sh, cli/list_user_prs.py, and cli/add_pr_dates.py as a per-user pipeline (list a user's PRs/MRs across GitHub + GitLab in parallel → batch-analyze → enrich with pr_date).
• b63abeb then moves them to a gitignored scripts/ folder so they don't ship with the production CLI, and drops the corresponding list-user-prs / add-pr-dates typer subcommands and imports from cli/main.py. The relocated scripts use absolute imports against cli.* and load tokens from scripts/.env via python-dotenv.

Housekeeping in b63abeb

• Fixes three tests/test_gitlab.py pagination cases that hung under GITLAB_DIFFS_PER_PAGE = 20 because the mocks were still sized for 100.
• Drops unused imports flagged by ruff.
• Applies black formatting drift across cli/ and tests/.

Production CLI surface (unchanged for existing users)

complexity-cli exposes the same four commands as before:

• analyze-pr — now accepts GitLab MR URLs
• batch-analyze — now accepts mixed-provider input files; gains --no-verify-ssl and --gitlab-token
• rate-limit
• label-pr — GitHub-only (GitLab MRs are skipped with a clear message in batch mode)

Test plan

• pytest -q — 210 passed
• ruff check — clean
• black --check — clean
• Single MR: complexity-cli analyze-pr <self-hosted-gitlab-MR-URL> --no-verify-ssl succeeds against git.datik.io.
• Mixed batch: complexity-cli batch-analyze --input-file <urls.txt> --output out.csv analyzed 54 GitHub PRs end-to-end (54-row CSV with provider, complexity, explanation columns).
• Per-user pipeline (gitignored): bash scripts/analyze_user.sh orengriffin 1 produced a complete orengriffin.csv with pr_url, pr_date, complexity, explanation.
• Reviewer should sanity-check that no production code path imports anything from scripts/.

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