chore: CLAUDE.md aus Repo entfernen, in .gitignore aufnehmen

CLAUDE.md enthält lokale Claude-Code-Anweisungen und gehört nicht ins
öffentliche Repository.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -43,3 +43,6 @@ Thumbs.db
 # Secrets (extra safeguard)
 *.env
 .env.*
+
+# Claude Code instructions (local only)
+CLAUDE.md

CLAUDE.md

@@ -1,85 +0,0 @@
-# CLAUDE.md
-
-This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
-
-## Commands
-
-```bash
-# Install dependencies
-pip install -r requirements.txt
-
-# Run all tests
-pytest tests/ -v
-
-# Run a single test file
-pytest tests/test_extractor.py -v
-
-# Run a single test
-pytest tests/test_differ.py::TestScoreDiff::test_green_for_no_changes -v
-
-# CLI usage (always run from project root where config.yaml lives)
-python -m scanner status
-python -m scanner init
-python -m scanner scan
-python -m scanner approve --all --note "Reason"
-python -m scanner approve --url https://bredelar.info/page/
-python -m scanner report
-python -m scanner --verbose scan
-```
-
-## Architecture
-
-The scanner is a Python package (`scanner/`) invoked via `python -m scanner`. All subcommands share one data flow:
-
-```
-Crawler → Extractor → BaselineManager (snapshot)
-                              ↓
-                    differ.compare_snapshots
-                              ↓
-                    differ.score_diff  →  alerter.send_alert
-                              ↓
-                    __main__._write_report (JSON + MD)
-```
-
-**Key design constraint**: The baseline is immutable except through an explicit `approve` call. `compare_snapshots` and `score_diff` are pure functions — they never write anything.
-
-### Module responsibilities
-
-- **`config.py`** — loads `config.yaml`, deep-merges onto `DEFAULT_CONFIG`. All paths (data_dir, reports_dir, logs_dir, config_dir) are resolved to absolute paths by `resolve_paths()` before being passed to other modules.
-- **`crawler.py`** — breadth-first crawl using a shared `requests.Session` (keep-alive). `normalize_url()` is the canonical URL form used everywhere (strips fragment, lowercases host, removes noise query params via whole-key matching in `_is_noise_param`, sorts remaining params). `should_crawl()` filters out binary assets and tracking URLs.
-- **`extractor.py`** — parses HTML with bs4+lxml. Returns a single dict per page with keys: `text`, `links`, `metadata`, `hidden_content`, `inline_scripts`, `jsonld`, `comment_links`. The `links` dict has typed sub-lists (`a`, `link_rel`, `script`, `img`, `iframe`, `form`, `meta_refresh`, `canonical`). `strip_cache_params()` removes cache-buster query params (e.g. `style.css?v=123`) from asset URLs (`link_rel`/`script`/`img`) **at extraction time**, so snapshots store stable URLs — this is the single source of truth for cache-buster normalisation.
-- **`baseline.py`** — `BaselineManager` handles two separate stores: `data/snapshots/YYYYMMDD_HHMMSS/` (raw crawl output) and `data/baseline/` (approved reference). Each page is stored as `<url_key(url)>.json`. Snapshot `manifest.json` also records crawl `errors`. `approve_*` methods are the only path into the baseline.
-- **`differ.py`** — `compare_snapshots(baseline_pages, current_pages, cfg)` returns a flat diff dict (incl. `unexpected_jsonld`, `new_broken_urls`, `known_broken_urls`). `score_diff(diff, cfg)` maps it to `{score, level, reasons, exit_code}`. Thresholds: yellow ≥ 20, red ≥ 60 (configurable). Unexpected JSON-LD `@type` is detected independently of page diffs (flags only types not allowed AND not already in the baseline for that URL). A single new external domain = 50 pts (yellow); combined with hidden content = 90 pts (red).
-- **`checker.py`** — stateless helpers for whitelist enforcement (`check_links_against_whitelist`), security-header auditing (`check_security_headers`, informational only — not scored), and webshell/backdoor filename detection (`is_suspicious_url`, word-boundary anchored to avoid false positives). Called from `__main__.cmd_check` only on `status == 200` pages.
-- **`alerter.py`** — sends alert only when `level >= min_level`. SMTP password is read from the env var named in `smtp_password_env` (default: `SCANNER_SMTP_PASSWORD`).
-- **`__main__.py`** — wires everything together. `cmd_scan` = `cmd_crawl` (crawl + save snapshot) + `cmd_check` (load baseline + snapshot, diff, score, report, alert). Exit codes: 0=green, 1=yellow, 2=red.
-
-### Data layout
-
-```
-data/baseline/manifest.json          # approved_at, approved_by, note, urls[]
-data/baseline/pages/<16hex>.json     # one file per approved URL
-data/snapshots/YYYYMMDD_HHMMSS/      # one dir per crawl run
-reports/YYYYMMDD_HHMMSS/report.{json,md}
-config/allowed_external.yaml         # set of permitted external domains
-config/ignore_rules.yaml             # normalization selectors + regex patterns
-```
-
-### Scoring weights (defaults, all configurable in `config.yaml`)
-
-| Event | Points |
-|---|---|
-| Suspicious filename (webshell/backdoor link) | 60 |
-| New external domain | 50 |
-| Hidden content (CSS-hidden element with links/text) | 40 |
-| Meta-Refresh | 40 |
-| Unexpected canonical | 35 |
-| Unexpected JSON-LD @type | 35 |
-| New internal URL | 30 |
-| New suspicious inline script | 30 |
-| Comment-embedded link | 25 |
-| Large text addition (>200 chars) | 20 |
-| Missing internal URL | 20 |
-| New broken link (4xx/5xx, not in baseline) | 20 |
-
-Security headers are audited and reported but **not** scored. Known broken links (already in the baseline) are reported but not scored.