name: harden description: | Web hardening audit — transport (HTTPS/TLS, HTTP→HTTPS redirect, HSTS), security headers (CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy), cookie flags (Secure, HttpOnly, SameSite), canonical URLs, custom 404, and server config hardening (.htaccess, nginx.conf, netlify.toml, vercel.json, _headers, _redirects, wrangler.toml). Dispatches the seo-analyzer agent with a STRICT scope filter — no meta/OG/JSON-LD/sitemap/CWV/headings/alt/i18n noise. Produces .claude/audits/HARDEN.md. Trigger: "harden", "web hardening", "ssl audit", "https audit", "hsts", "csp", "security headers", "http to https", "redirect audit", "htaccess audit", "404 page", "canonical audit", "transport security", "durcissement web", "audit sécurité web", "entêtes sécurité". For full SEO audit (meta/OG/JSON-LD/sitemap/CWV) → use /seo. For AI search / llms.txt / AI crawlers → use /geo. For secrets / dependency CVEs / OWASP code-level → use /cso. argument-hint: [URL] [--fix] [--local|--full] [--no-external] allowed-tools:

Read
Edit
Write
Bash
Grep
Glob
Agent
WebFetch ---

/harden — web hardening audit

This skill orchestrates a narrow-scope hardening audit: TLS + security headers + redirects + canonical + custom 404 + server configs. It reuses the seo-analyzer agent with a strict scope filter to avoid producing a full SEO report.

Scope boundary:

In: HTTPS transport, HSTS, CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy, cookie flags, canonical URL correctness, custom 404 (status + presence), .htaccess / nginx.conf / netlify.toml / vercel.json / _headers / _redirects / wrangler.toml hardening.
Out: meta tags (title/description/OG/Twitter), JSON-LD / Schema.org, sitemap.xml, robots.txt directives (except hardening-related rewrites), hreflang, i18n, headings, alt attrs, image compression, Core Web Vitals, GMB/NAP, content, llms.txt, AI crawlers. Those are owned by /seo and /geo.

If a finding appears in an out-of-scope file (e.g. meta tag duplication), it is dropped silently — /harden stays focused.

External validators (FULL mode only)

In addition to the code-level + live-curl audit, /harden queries three independent third-party grading services and embeds their verdict in the report. These are the industry-standard cross-checks users will run anyway — better to have them inside the report than force the user to copy-paste URLs.

Validator	URL	API?	Latency	What it grades
Mozilla Observatory	observatory.mozilla.org	Yes (v2 JSON)	~10s	HTTP headers, CSP, HSTS, cookie flags, CORS (score 0-135 + grade A+..F)
SecurityHeaders.com	securityheaders.com	No (HTML scrape)	~5s	HTTP security headers (grade A+..F)
SSL Labs	ssllabs.com/ssltest	Yes (v3 JSON, async)	1-3 min	TLS config, cipher suites, cert chain (grade A+..F + T for trust issues)

Skip with --no-external. Skipped automatically in LOCAL mode (need a live URL).

STEP 0 — Collect context

Parse arguments

If $ARGUMENTS contains an https?:// URL → capture as TARGET_URL.
Extract DOMAIN from TARGET_URL : DOMAIN=${TARGET_URL#http*://}; DOMAIN=${DOMAIN%%/*}.
If $ARGUMENTS contains --fix → MODE=fix. Else MODE=audit (default).
If $ARGUMENTS contains --local → DEPTH=LOCAL.
If $ARGUMENTS contains --full → DEPTH=FULL.
If neither --local nor --full but TARGET_URL present → default DEPTH=FULL.
If neither and no URL → default DEPTH=LOCAL.
If $ARGUMENTS contains --no-external → EXTERNAL=off. Else EXTERNAL=on (default).
EXTERNAL is ignored in LOCAL mode (skipped silently — no URL to scan).

Detect config files

ls .htaccess nginx.conf netlify.toml vercel.json wrangler.toml _headers _redirects \
   .well-known/ 2>/dev/null
# Framework-level redirect/header sources
ls next.config.js next.config.mjs next.config.ts \
   astro.config.mjs astro.config.ts \
   middleware.ts middleware.js \
   2>/dev/null

Record presence. Missing config files are not automatically a problem — a Next.js app may configure headers via next.config.js headers() or middleware.ts. Don't recommend .htaccess on a Next app.

FULL mode probe (only if DEPTH=FULL)

# Resolve redirect chain
curl -sI -o /dev/null -w "URL: %{url_effective}\nCODE: %{http_code}\nREDIRS: %{num_redirects}\n" -L "$TARGET_URL"
# Live headers (HTTPS)
curl -sI "https://${TARGET_URL#https://}" | head -40
# HTTP → HTTPS redirect check
curl -sI "http://${TARGET_URL#https://}" | head -10

Store raw outputs for the agent.

Display collected context

HARDEN — context
URL          : <url or — (static mode)>
Domain       : <domain or —>
Depth        : LOCAL | FULL
Mode         : audit | fix
External     : on | off (auto-off in LOCAL)
Config files : [.htaccess, nginx.conf, ...] or — none detected
Framework    : [next | astro | wordpress | static-html | other]

In fix mode, warn: ⚠️ Fixes will be proposed as diffs. Applied only after confirmation.

STEP 0b — Launch external validators (FULL + EXTERNAL=on only)

Skip this step entirely if DEPTH=LOCAL or EXTERNAL=off.

Create .harden-cache/ (gitignored) to store raw scan outputs :

mkdir -p .harden-cache
grep -q '^\.harden-cache/' .gitignore 2>/dev/null || \
  printf '\n# /harden external scan cache\n.harden-cache/\n' >> .gitignore

1) SSL Labs — launch in background (slowest, 1-3 min)

Try cached result first (maxAge=24 returns a scan < 24h old instantly) :

curl -s --max-time 15 \
  "https://api.ssllabs.com/api/v3/analyze?host=${DOMAIN}&maxAge=24&all=done" \
  > .harden-cache/ssllabs.json

Check status :

jq -r '.status // "ERROR"' .harden-cache/ssllabs.json

If READY → done, cached hit. Skip background launch. If IN_PROGRESS or DNS → a scan is already running — poll in STEP 1.5. If anything else (ERROR, empty, missing) → start a fresh scan in background :

curl -s --max-time 15 \
  "https://api.ssllabs.com/api/v3/analyze?host=${DOMAIN}&startNew=on&all=done&ignoreMismatch=on" \
  > .harden-cache/ssllabs.json

This only STARTS the scan — the response body contains status=DNS or status=IN_PROGRESS. We poll in STEP 1.5 while seo-analyzer runs.

2) Mozilla Observatory — synchronous, fast (~10s)

API v2 : POST https://observatory-api.mdn.mozilla.net/api/v2/scan?host=DOMAIN

curl -s --max-time 30 -X POST \
  "https://observatory-api.mdn.mozilla.net/api/v2/scan?host=${DOMAIN}" \
  -o .harden-cache/observatory.json

Extract headline :

jq -r '"Grade: \(.grade // "N/A") | Score: \(.score // "N/A") / 135 | Tests passed: \(.tests_passed // 0) / \(.tests_quantity // 0)"' \
  .harden-cache/observatory.json 2>/dev/null \
  || echo "Observatory: FAILED"

3) SecurityHeaders.com — synchronous HTML scrape (~5s)

No public API. Fetch the HTML report page and extract the grade from the response markup :

curl -sL --max-time 30 \
  "https://securityheaders.com/?q=${TARGET_URL}&hide=on&followRedirects=on" \
  > .harden-cache/securityheaders.html

Extract grade. The page embeds the grade in a <div class="score score_X"> container where X is lowercase of A/B/C/D/E/F/R. Fallback patterns in case they change markup :

grep -oE 'class="score_[a-f]"' .harden-cache/securityheaders.html | head -1 \
  | sed 's/.*score_\([a-f]\).*/\1/' | tr 'a-f' 'A-F' \
  || grep -oE 'Security Report Summary - [A-F][+]?' .harden-cache/securityheaders.html | head -1

If both fail, fall back to WebFetch : WebFetch(url="https://securityheaders.com/?q=${TARGET_URL}", prompt="extract the letter grade (A+..F) from the 'Security Report Summary' section").

Also extract the per-header checklist (X-Frame-Options: present/missing, CSP: present/missing, etc.) from the HTML to feed the seo-analyzer :

grep -oE '(X-Frame-Options|Strict-Transport-Security|Content-Security-Policy|X-Content-Type-Options|Referrer-Policy|Permissions-Policy)[^<]{0,50}' \
  .harden-cache/securityheaders.html | sort -u > .harden-cache/securityheaders-findings.txt

4) Write a partial external-scores summary

{
  echo "# External validators — partial results"
  echo "Domain: ${DOMAIN}"
  echo "Timestamp: $(date -Iseconds)"
  echo
  echo "## Mozilla Observatory"
  jq -r '"Grade: \(.grade // "PENDING")\nScore: \(.score // "PENDING") / 135\nTests: \(.tests_passed // 0)/\(.tests_quantity // 0) passed\nFailed tests: \(.tests_failed // 0)"' \
    .harden-cache/observatory.json 2>/dev/null || echo "FAILED — check .harden-cache/observatory.json"
  echo
  echo "## SecurityHeaders.com"
  echo "Grade: $(grep -oE 'score_[a-f]' .harden-cache/securityheaders.html 2>/dev/null | head -1 | sed 's/score_//' | tr a-f A-F || echo "PENDING")"
  echo "Findings:"
  cat .harden-cache/securityheaders-findings.txt 2>/dev/null || echo "  (none extracted)"
  echo
  echo "## SSL Labs"
  jq -r '"Status: \(.status // "PENDING")\nEndpoints: \(.endpoints | length // 0)\nOverall grade: \(.endpoints[0].grade // "PENDING")"' \
    .harden-cache/ssllabs.json 2>/dev/null || echo "PENDING — poll in STEP 1.5"
} > .harden-cache/external-scores.md

5) Display to user

EXTERNAL VALIDATORS — partial results
Mozilla Observatory : <Grade>  (score / 135)
SecurityHeaders.com : <Grade>
SSL Labs            : <Status — PENDING if still running, grade if READY>

(Full JSON/HTML cached in .harden-cache/ — SSL Labs poll continues during audit.)

Do NOT block on SSL Labs here. Continue to STEP 1 immediately — the seo-analyzer will run in parallel.

STEP 1 — Dispatch seo-analyzer (narrow scope)

Spawn a single seo-analyzer subagent with an explicit IN/OUT scope list.

Agent(
  subagent_type="seo-analyzer",
  description="harden — narrow-scope web hardening audit",
  prompt="""
  Dispatched from /harden. NARROW-SCOPE audit — DO NOT produce a full
  SEO report. You are acting as a hardening auditor, not a marketing-SEO
  auditor.

  CONTEXT:
    TARGET_URL       : <url or "none — LOCAL mode">
    DEPTH            : <LOCAL | FULL>
    MODE             : <audit | fix>
    CONFIG_FILES     : <list>
    FRAMEWORK        : <name>
    EXTERNAL_SCORES  : <path to .harden-cache/external-scores.md, or "none — skipped">

  If EXTERNAL_SCORES is provided, READ that file before starting. It
  contains grades from Mozilla Observatory, SecurityHeaders.com, and
  (possibly, if READY) SSL Labs. Use those as independent cross-checks
  of your own findings :
    - If Observatory grade is A/A+ but you found CSP missing in the code
      → re-verify; Observatory is authoritative on live headers
    - If SecurityHeaders grade is F but your code audit says "all good"
      → the deployed config differs from the source — flag it
    - Quote the grades verbatim in the report's "External validators"
      section — do not summarize, do not re-grade

  STRICT SCOPE — audit ONLY these areas:

    1. Transport (HTTPS / TLS)
       - HTTP → HTTPS redirect (301 permanent, no meta-refresh, no JS)
       - Redirect chain length ≤ 1 (no HTTP → www → HTTPS → canonical)
       - TLS version (≥ 1.2, prefer 1.3) — FULL only
       - Cookie flags : Secure, HttpOnly, SameSite=Lax|Strict on auth cookies

    2. HSTS
       - Strict-Transport-Security header present
       - max-age ≥ 31536000 (1 year)
       - includeSubDomains directive
       - preload directive (optional but recommended if eligible)

    3. Security headers
       - Content-Security-Policy : present, no unsafe-inline/unsafe-eval
         unless justified, report-uri/report-to endpoint if available
       - X-Frame-Options : DENY or SAMEORIGIN
       - X-Content-Type-Options : nosniff
       - Referrer-Policy : no-referrer | strict-origin-when-cross-origin
       - Permissions-Policy : restrictive scope (camera=(), microphone=(), etc.)
       - Cross-Origin-Opener-Policy : same-origin (recommended)
       - Cross-Origin-Resource-Policy : same-origin (recommended)

    4. Canonical
       - <link rel="canonical"> present on every HTML page
       - href is ABSOLUTE URL (not relative)
       - Canonical target matches the final URL after redirects
         (no canonical → redirect chain)
       - No conflicting canonical + robots noindex
       - Self-referential canonical on homepage

    5. Error pages (status + presence)
       - Custom 404 page present (not the default server page)
       - 404 route returns status code 404 (not 200 "soft 404")
       - Optional : custom 500 page with status 500
       - ErrorDocument / error_page directive configured

    6. Server config hardening (LOCAL : grep; FULL : verify headers live)
       - .htaccess : RewriteRule for HTTP→HTTPS, Header set CSP/HSTS/etc.,
         ErrorDocument 404, Options -Indexes
       - nginx.conf : return 301 https://, add_header, error_page 404,
         autoindex off
       - netlify.toml / _headers / _redirects : [[headers]] + [[redirects]]
         with status=301 force=true
       - vercel.json : headers[] + redirects[] arrays with permanent=true
       - wrangler.toml / Cloudflare : headers transform rules
       - Framework-native : Next.js next.config headers()/redirects()/
         middleware, Astro astro.config.integrations

  OUT OF SCOPE — DO NOT report any of the following, even if you see it:
    - meta title, description, OG tags, Twitter cards
    - JSON-LD / Schema.org / microdata / RDFa
    - sitemap.xml, image/video sitemaps
    - robots.txt classical directives (User-agent, Disallow for crawl budget)
    - AI crawler directives (GPTBot, ClaudeBot, etc.) — owned by /geo
    - llms.txt, llms-full.txt — owned by /geo
    - hreflang, lang attribute, i18n
    - headings hierarchy, heading content
    - alt attributes, image formats, image compression
    - Core Web Vitals (LCP, INP, CLS), perf budgets
    - GMB, NAP, local SEO, reviews, citations
    - Legal pages (mentions légales, CGV, privacy) — unless the issue is
      a security-header gap on those pages, not their content
    - Content quality, keyword density, readability
    - a11y / WCAG (owned by /validate — W3C + WCAG audit)
    - W3C HTML / CSS syntactic validity (owned by /validate)

  If you detect an out-of-scope issue, DROP IT silently. Do NOT mention
  it even as a "note". Stay focused.

  Mode behavior :
    - MODE=audit : NO file modifications. Report-only. Propose fixes as
      diffs embedded in the report (```diff blocks), but do NOT apply.
    - MODE=fix   : Report issues first, then for each Critique/Haute
      issue produce a concrete diff. STOP and emit
      "READY TO APPLY — awaiting dispatcher confirmation" at the end.
      Do NOT apply any Edit/Write — the dispatcher handles STEP 3.

  OUTPUT — write to <PROJECT_ROOT>/.claude/audits/HARDEN.md (run `mkdir -p .claude/audits` first) :

    # Web Hardening Report — <project_name>

    **Date**       : <YYYY-MM-DD>
    **URL**        : <url or "static mode">
    **Depth**      : LOCAL | FULL
    **Mode**       : audit | fix
    **Score**      : XX / 100

    ## 0. Critical alerts
    <only Critique-severity items, 1-line each>

    ## 1. Score breakdown
    | Area              | Score | Status |
    | Transport         | XX/20 | ✅/⚠️/❌ |
    | HSTS              | XX/15 | ... |
    | Security headers  | XX/25 | ... |
    | Canonical         | XX/10 | ... |
    | Error pages       | XX/10 | ... |
    | Config hardening  | XX/20 | ... |

    ## 1.bis External validators (FULL mode only)
    Independent third-party grades. Include verbatim — no re-grading.

    | Validator              | Grade | Detail                              | Link |
    |---|---|---|---|
    | Mozilla Observatory    | <A+>  | <score>/135 — <N>/<M> tests passed  | https://developer.mozilla.org/en-US/observatory/analyze?host=<domain> |
    | SecurityHeaders.com    | <A>   | <missing headers list>              | https://securityheaders.com/?q=<url> |
    | SSL Labs (Qualys)      | <A+>  | TLS <1.3> — <cert-chain-note>       | https://www.ssllabs.com/ssltest/analyze.html?d=<domain> |

    If any validator status is PENDING at write time (SSL Labs timeout),
    note: `⚠️ SSL Labs scan did not finish within timeout — re-run /harden
    in a few minutes for the grade. Live URL: <link>`.

    ### Divergences between code audit and external validators
    If your code-level findings contradict what external validators
    report (e.g. you said "CSP looks good" but Observatory says CSP
    missing), list each divergence here with probable cause (config
    drift, CDN overriding headers, conditional headers, etc.).

    ## 2. Transport (HTTPS/TLS)
    ### [Severity] <issue title>
    **Evidence** : <curl output | fichier:ligne>
    **Impact**   : <1 sentence>
    **Fix**      :
    ```diff
    <concrete diff>
    ```

    ## 3. HSTS
    ## 4. Security headers
    ## 5. Canonical
    ## 6. Error pages
    ## 7. Server config hardening

    ## 8. Fix bundle (MODE=fix only)
    Grouped patches by file :
    - `.htaccess` : <N fixes> (1 bundle)
    - `next.config.js` : <N fixes>
    - ...
    Each bundle = one Edit/Write operation.
    At the end : `READY TO APPLY — awaiting dispatcher confirmation`

    ## 9. Appendix — not auditable
    <what couldn't be checked + why>

  Scoring :
    - 100/100 = no issues at any severity
    - Each Critique : -15
    - Each Haute    : -8
    - Each Moyenne  : -3
    - Each Basse    : -1
    - Clamp [0, 100]

  Severity guide :
    - Critique : HTTP → HTTPS missing, CSP absent on public site,
      cookie without Secure+HttpOnly on auth, soft 404 (200 code on
      missing route), .env in repo with live creds
    - Haute    : HSTS absent or max-age < 1 year, X-Frame-Options missing,
      canonical pointing to a redirect, no custom 404
    - Moyenne  : Referrer-Policy missing, includeSubDomains missing,
      redirect chain length > 1
    - Basse    : preload directive missing, COOP/CORP absent,
      Permissions-Policy not explicit

  Max 600 lines. Cite file:line or curl output for every finding.
  """
)

STEP 1.5 — Finalize SSL Labs (FULL + EXTERNAL=on only)

Skip if LOCAL or EXTERNAL=off or if .harden-cache/ssllabs.json already shows status=READY in STEP 0b.

While seo-analyzer was running, the SSL Labs scan has had ~30-90s of runtime. Poll with short waits, bounded by a 180s cap. Do NOT use long leading sleeps — short polls avoid harness sleep-blocking.

# Poll loop — max 180s total (12 iterations × 15s), exit early on READY/ERROR
for i in $(seq 1 12); do
  curl -s --max-time 15 \
    "https://api.ssllabs.com/api/v3/analyze?host=${DOMAIN}" \
    > .harden-cache/ssllabs.json
  STATUS=$(jq -r '.status // "ERROR"' .harden-cache/ssllabs.json)
  echo "SSL Labs poll $i/12 — status=$STATUS"
  case "$STATUS" in
    READY|ERROR) break ;;
  esac
  sleep 15
done

After the loop :

FINAL_STATUS=$(jq -r '.status // "TIMEOUT"' .harden-cache/ssllabs.json)
if [ "$FINAL_STATUS" = "READY" ]; then
  jq -r '.endpoints[] | "  • \(.ipAddress) — grade \(.grade // "N/A") — \(.statusMessage // "")"' \
    .harden-cache/ssllabs.json
else
  echo "⚠️  SSL Labs did not finalize within 180s (status=$FINAL_STATUS)"
  echo "    Result cached — will auto-hit on re-run via maxAge=24"
fi

Update .harden-cache/external-scores.md with the final SSL Labs verdict so the HARDEN.md "External validators" table reflects it. If the user already read HARDEN.md, they can re-run /harden <url> to pick up the cached (now-READY) SSL Labs result.

STEP 2 — Verify output

test -s .claude/audits/HARDEN.md && wc -l .claude/audits/HARDEN.md || echo "MISSING .claude/audits/HARDEN.md"

If missing or empty :

⚠️  seo-analyzer did not produce .claude/audits/HARDEN.md. Options:
  A) Retry with same scope
  B) Downgrade to LOCAL and retry (if FULL failed on network)
  C) Abort

Extract the score and critical-alert count from .claude/audits/HARDEN.md for the console summary.

STEP 3 — Apply fixes (MODE=fix only)

Skip this step if MODE=audit.

If MODE=fix and .claude/audits/HARDEN.md ends with READY TO APPLY — awaiting dispatcher confirmation :

Parse the ## 8. Fix bundle section from .claude/audits/HARDEN.md.
Group by file. For each group, show the combined diff to the user.

Ask :

HARDEN — fix bundle ready

Files to modify (N) :
 - .htaccess           (3 fixes : HTTP→HTTPS redirect, HSTS, 404 page)
 - next.config.js      (2 fixes : CSP header, X-Frame-Options)

Options :
 A) Apply all
 B) Review each diff before applying
 C) Apply only Critique severity
 D) Abort — keep .claude/audits/HARDEN.md as audit report

On A : apply each bundle via Edit (targeted old_string/new_string, never full-file Write on shared templates).
On B : for each diff, show and ask yes/no/skip.
On C : filter to Critique-only, then behave as A.
On D : stop, leave .claude/audits/HARDEN.md untouched.

After applying : append a ## 10. Changes applied section to .claude/audits/HARDEN.md with commit-ready summary lines.

Never apply fixes without explicit confirmation. Never use --no-verify on git hooks if a pre-commit hook exists and runs during fix application.

STEP 4 — Console summary

HARDEN AUDIT COMPLETE
URL              : <url or static>
Depth            : LOCAL | FULL
Mode             : audit | fix
Score            : XX / 100  (<before> → <after> if fix applied)
Critical alerts  : <N>  (voir .claude/audits/HARDEN.md § 0)
Report           : .claude/audits/HARDEN.md

EXTERNAL VALIDATORS (FULL only) :
  Mozilla Observatory   : <Grade>   (score/135)
  SecurityHeaders.com   : <Grade>
  SSL Labs (Qualys)     : <Grade>   (TLS <version>)
  [if SSL Labs TIMEOUT] ⚠️ re-run /harden <url> in a few minutes — cached

TOP 3 ACTIONS (by severity × exploitability) :
  1. [Critique] <title>
  2. [Haute]    <title>
  3. [Haute]    <title>

NEXT STEPS :
  • /harden <url> --fix          → apply recommended fixes
  • /harden <url> --full          → re-run with live HTTP probing
  • /harden <url> --no-external  → skip third-party scanners (faster)
  • /hotfix <specific issue>     → quick fix on a single finding
  • /seo / /geo / /cso            → complementary audits (other scopes)

Rules

Scope is non-negotiable. If you find yourself reporting meta tags, sitemap, or JSON-LD, you drifted. Drop it. /seo owns that.
Single agent dispatch. No parallel fan-out. Only seo-analyzer is needed — it already owns .htaccess and security headers per /seo ownership matrix.
Never apply fixes without user confirmation, even in --fix. The fix mode prepares the bundle; the dispatcher confirms.
LOCAL vs FULL is about data sources, not scope. Both cover the same 6 areas. LOCAL is blind to live HSTS/CSP headers on production.
Framework awareness. Don't recommend .htaccess on a Next.js / Astro / Cloudflare Pages project. Use the framework-native mechanism (next.config.js headers(), astro middleware, _headers).
Respect CLAUDE.md architecture rules. Security headers and redirects are non-negotiable defaults per user's global CLAUDE.md — every public site must ship them. Flag absence as Critique, not Moyenne.
External validators are authoritative on live headers, not the code. If Observatory/SecurityHeaders/SSL Labs and the code audit disagree, the external grade reflects the deployed production config — the code audit reflects source. Both matter; the divergence itself is a finding (config drift, CDN override, conditional middleware). Quote external grades verbatim, never re-grade them.
SSL Labs can be slow and fail-soft. 180s poll cap. If TIMEOUT, note it in HARDEN.md and move on. Cached result auto-hits on next run via maxAge=24. Never block the whole audit waiting on SSL Labs.
One report file. .claude/audits/HARDEN.md. On re-run, move previous content to a ## Historique section, do not overwrite silently.

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