diff --git a/.gitea/workflows/cd.yml b/.gitea/workflows/cd.yml
index 89d12d1..c54127e 100644
--- a/.gitea/workflows/cd.yml
+++ b/.gitea/workflows/cd.yml
@@ -18,6 +18,14 @@ on:
   push:
     branches: [main]
   workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: cd-${{ github.ref }}
+  cancel-in-progress: false # never cancel an in-flight deploy trigger
+
 jobs:
   deploy:
     runs-on: ubuntu-latest
diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
index 9029ea0..7ca81c7 100644
--- a/.gitea/workflows/ci.yml
+++ b/.gitea/workflows/ci.yml
@@ -9,26 +9,46 @@ name: CI (SIAX Cloud)
 #                 is inherited debt; continue-on-error so it never blocks).
 #   * build     (BLOCKING) -> `next build`.
 #
-# Nightly re-runs + Trivy security scanning live in nightly.yml and
-# security.yml (this file is push/PR-only).
+# Nightly re-runs + Trivy/gitleaks security scanning live in nightly.yml and
+# security.yml (this file is push/PR-only). BACKLOG P1-15: `permissions`,
+# `concurrency`, and a pinned pnpm-store cache added; CODEOWNERS added at the
+# repo root (Gitea auto-reviewer assignment); actions pinned to commit SHAs
+# (BACKLOG P1-14 digest-pinning).
 on:
   push:
     branches: ["**"]
   pull_request:
   workflow_dispatch:
 
+permissions:
+  contents: read
+
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   quality:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
+      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
         with:
           node-version: "22"
       - name: Enable corepack + pin pnpm@9 (pnpm-lock.yaml is lockfileVersion 9.0)
         run: |
           corepack enable
           corepack prepare pnpm@9 --activate
+      - name: Get pnpm store directory
+        id: pnpm-cache
+        run: echo "STORE_PATH=$(pnpm store path --silent)" >> "$GITHUB_OUTPUT"
+      - name: Cache pnpm store
+        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
+        with:
+          path: ${{ steps.pnpm-cache.outputs.STORE_PATH }}
+          key: ${{ runner.os }}-pnpm-store-${{ hashFiles('pnpm-lock.yaml') }}
+          restore-keys: |
+            ${{ runner.os }}-pnpm-store-
       - name: Install (frozen lockfile)
         run: pnpm install --frozen-lockfile
       - name: Typecheck (tsc over src/ + tests/ -- blocking)
@@ -44,14 +64,18 @@ jobs:
   # Kept in ci.yml (advisory) so the protected-branch status check contexts
   # "CI (SIAX Cloud) / quality (push)" + "CI (SIAX Cloud) / security (push)"
   # are always reported on push. security.yml is the dedicated scanner on
-  # push/PR/weekly; this job guarantees the required check exists.
+  # push/PR/weekly and is now BLOCKING (BACKLOG P0-16) -- this copy is kept
+  # advisory on purpose: it exists only to guarantee the status-check context
+  # is always present (see the comment this repeats from before), not as a
+  # second enforcement point. Do not treat a green run of *this* job as a
+  # security clearance -- see security.yml's `trivy` + `gitleaks` jobs.
   security:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - name: Install Trivy
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
+      - name: Install Trivy (pinned)
         run: |
-          curl -sfL https://raw.githubusercontent.com/aquasecurity/trivy/main/contrib/install.sh | sh -s -- -b /usr/local/bin
-      - name: Trivy scan (vuln + secrets, advisory)
+          curl -sfL https://raw.githubusercontent.com/aquasecurity/trivy/main/contrib/install.sh | sh -s -- -b /usr/local/bin v0.73.0
+      - name: Trivy scan (vuln + secrets, advisory -- see security.yml for the blocking scan)
         run: |
-          trivy fs --scanners vuln,secret --severity HIGH,CRITICAL --exit-code 0 .
+          trivy fs --scanners vuln,secret --severity HIGH,CRITICAL --skip-dirs services/scrapers --exit-code 0 .
diff --git a/.gitea/workflows/health-check.yml b/.gitea/workflows/health-check.yml
index 90aece5..fa47e4c 100644
--- a/.gitea/workflows/health-check.yml
+++ b/.gitea/workflows/health-check.yml
@@ -1,18 +1,28 @@
 name: Health Check (SIAX Cloud)
+
+# Weekly informational repo-health ping (no push/PR trigger, nothing to
+# block) -- kept advisory on purpose. The BLOCKING secret/vuln gates live in
+# security.yml (gitleaks + Trivy, BACKLOG P0-16/P0-19), which runs on every
+# push/PR; this job's own Trivy step stays `--exit-code 0` because there is
+# no merge for it to gate.
 on:
   workflow_dispatch:
   schedule:
     - cron: "0 6 * * 1"
+
+permissions:
+  contents: read
+
 jobs:
   health:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
       - name: Required files
         run: |
-          for f in README.md LICENSE .gitignore; do [ -f "$f" ] || echo "::warning file=$f,title=Missing::$f is missing"; done
+          for f in README.md LICENSE .gitignore CODEOWNERS; do [ -f "$f" ] || echo "::warning file=$f,title=Missing::$f is missing"; done
           [ -f .gitea/workflows/ci.yml ] || echo "::warning title=No CI::No CI workflow found"
-      - name: Install Trivy
-        run: curl -sfL https://raw.githubusercontent.com/aquasecurity/trivy/main/contrib/install.sh | sh -s -- -b /usr/local/bin
-      - name: Secret scan
+      - name: Install Trivy (pinned)
+        run: curl -sfL https://raw.githubusercontent.com/aquasecurity/trivy/main/contrib/install.sh | sh -s -- -b /usr/local/bin v0.73.0
+      - name: Secret scan (informational -- see security.yml for the blocking gitleaks gate)
         run: trivy fs --scanners secret --exit-code 0 .
\ No newline at end of file
diff --git a/.gitea/workflows/nightly.yml b/.gitea/workflows/nightly.yml
index ab56288..0398c3b 100644
--- a/.gitea/workflows/nightly.yml
+++ b/.gitea/workflows/nightly.yml
@@ -1,19 +1,25 @@
 name: Nightly (SIAX Cloud)
 
 # Nightly full-gate re-run so CI exercises the repo even without pushes:
-# quality gate + advisory security scan. Fails loudly on regressions
-# introduced outside push-triggered runs (e.g. dependency drift).
+# quality gate + Trivy scan. Fails loudly on regressions introduced outside
+# push-triggered runs (e.g. dependency drift) -- the `security` job below is
+# therefore BLOCKING (BACKLOG P0-16), matching security.yml, not advisory:
+# a nightly run whose whole purpose is catching drift has no reason to stay
+# silent about it.
 on:
   workflow_dispatch:
   schedule:
-    - cron: "0 4 * * *"   # daily 04:00 UTC
+    - cron: "0 4 * * *" # daily 04:00 UTC
+
+permissions:
+  contents: read
 
 jobs:
   quality:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
+      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
         with:
           node-version: "22"
       - name: Enable corepack + pin pnpm@9
@@ -35,10 +41,12 @@ jobs:
   security:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - name: Install Trivy
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
+      - name: Install Trivy (pinned)
         run: |
-          curl -sfL https://raw.githubusercontent.com/aquasecurity/trivy/main/contrib/install.sh | sh -s -- -b /usr/local/bin
-      - name: Trivy fs scan (vuln + secrets, advisory)
+          curl -sfL https://raw.githubusercontent.com/aquasecurity/trivy/main/contrib/install.sh | sh -s -- -b /usr/local/bin v0.73.0
+      - name: Trivy fs scan (vuln + secrets -- BLOCKING, see BACKLOG P0-16)
         run: |
-          trivy fs --scanners vuln,secret --severity HIGH,CRITICAL --exit-code 0 .
+          trivy fs --scanners vuln,secret --severity HIGH,CRITICAL \
+            --skip-dirs services/scrapers \
+            --exit-code 1 .
diff --git a/.gitea/workflows/security.yml b/.gitea/workflows/security.yml
index 5717347..9be7e61 100644
--- a/.gitea/workflows/security.yml
+++ b/.gitea/workflows/security.yml
@@ -1,30 +1,96 @@
 name: Security Scan (SIAX Cloud)
 
-# Advisory security scanning on every push/PR + weekly re-run, matching the
-# fleet convention (--exit-code 0 so findings never block merges; they are
-# triaged via the repo's security channel and BACKLOG).
+# BACKLOG P0-16, P0-19, P1-14: this used to run Trivy with `--exit-code 0`,
+# i.e. purely advisory -- findings never blocked a merge. It now fails the
+# build for real on HIGH/CRITICAL, plus a dedicated gitleaks step (REPO-15:
+# the only prior secret sweep was hand-rolled regex, not a real
+# secret-scanning tool), plus an SBOM + license inventory as build artifacts.
 #
-# NOTE: findings on services/scrapers/* (FlareSolverr/Tor/curl_cffi) are
-# expected and out of scope for CI gating -- kept per the account owner's
-# dated, attributed decision (Simon Axelsson, 2026-08-11, interactive
-# prompt; no rationale beyond "keep it" given or invented). See SECURITY.md
-# and docs/compliance/GOLDEN-STANDARD-REPORT.md control C6 for full context.
+# `services/scrapers/` is excluded from the Trivy scan (--skip-dirs).
+# Findings there (waf_bypass.py, engine*.py, curl_cffi/cloudscraper/nodriver)
+# are expected and out of scope for CI gating -- kept per the account
+# owner's dated, attributed decision (Simon Axelsson, 2026-08-11; see
+# SECURITY.md and docs/compliance/GOLDEN-STANDARD-REPORT.md control C6).
+# That question is explicitly out of scope for this workflow change and
+# must not be the reason this gate starts failing for everyone. Every other
+# path in the repo is now enforced for real, including the rest of
+# services/ (the FastAPI engine itself).
 on:
   push:
     branches: ["**"]
   pull_request:
   workflow_dispatch:
   schedule:
-    - cron: "0 5 * * 1"   # weekly Monday re-scan
+    - cron: "0 5 * * 1" # weekly Monday re-scan
+
+permissions:
+  contents: read
+
+concurrency:
+  group: security-${{ github.ref }}
+  cancel-in-progress: true
 
 jobs:
-  security:
+  trivy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - name: Install Trivy
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
+      - name: Install Trivy (pinned)
         run: |
-          curl -sfL https://raw.githubusercontent.com/aquasecurity/trivy/main/contrib/install.sh | sh -s -- -b /usr/local/bin
-      - name: Trivy fs scan (vuln + secrets, advisory)
+          curl -sfL https://raw.githubusercontent.com/aquasecurity/trivy/main/contrib/install.sh | sh -s -- -b /usr/local/bin v0.73.0
+      - name: Trivy fs scan (vuln + secrets -- BLOCKING)
         run: |
-          trivy fs --scanners vuln,secret --severity HIGH,CRITICAL --exit-code 0 .
+          trivy fs --scanners vuln,secret --severity HIGH,CRITICAL \
+            --skip-dirs services/scrapers \
+            --exit-code 1 .
+      - name: SBOM (CycloneDX, informational artifact -- BACKLOG P1-14)
+        if: always()
+        run: |
+          trivy fs --format cyclonedx --output sbom.cdx.json --skip-dirs services/scrapers .
+      - name: Upload SBOM
+        if: always()
+        continue-on-error: true # informational artifact; must never block the blocking scan above
+        uses: actions/upload-artifact@c6a366c94c3e0affe28c06c8df20a878f24da3cf # v3.2.2 (Gitea Actions runner rejects v4 artifacts -- verified empirically 2026-08-11)
+        with:
+          name: sbom-cyclonedx
+          path: sbom.cdx.json
+          retention-days: 90
+
+  gitleaks:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
+        with:
+          fetch-depth: 0 # gitleaks needs full history, not just the tip commit
+      - name: Install gitleaks (pinned + checksum-verified)
+        run: |
+          curl -sSL -o gitleaks.tar.gz https://github.com/gitleaks/gitleaks/releases/download/v8.30.1/gitleaks_8.30.1_linux_x64.tar.gz
+          echo "551f6fc83ea457d62a0d98237cbad105af8d557003051f41f3e7ca7b3f2470eb  gitleaks.tar.gz" | sha256sum -c -
+          tar -xzf gitleaks.tar.gz gitleaks
+          sudo mv gitleaks /usr/local/bin/gitleaks
+      - name: gitleaks scan (full history -- BLOCKING)
+        run: gitleaks detect --source . --log-opts="--all" --redact --verbose
+
+  license-inventory:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
+      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
+        with:
+          node-version: "22"
+      - name: Enable corepack + pin pnpm@9
+        run: |
+          corepack enable
+          corepack prepare pnpm@9 --activate
+      - name: Install (frozen lockfile)
+        run: pnpm install --frozen-lockfile
+      - name: License inventory (informational -- BACKLOG P1-14)
+        run: |
+          pnpm licenses list --json > licenses.json || true
+          pnpm licenses list
+      - uses: actions/upload-artifact@c6a366c94c3e0affe28c06c8df20a878f24da3cf # v3.2.2 (Gitea Actions runner rejects v4 artifacts -- verified empirically 2026-08-11)
+        continue-on-error: true # informational artifact; must never block CI
+        with:
+          name: license-inventory
+          path: licenses.json
+          retention-days: 90
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 73a27fd..a6e022b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -30,6 +30,9 @@ on:
   push:
     branches-ignore: [main]
 
+permissions:
+  contents: read
+
 concurrency:
   group: ci-${{ github.ref }}
   cancel-in-progress: true
@@ -39,8 +42,8 @@ jobs:
     name: Typecheck + test
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
+      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
         with:
           node-version: '22'
       - name: Enable corepack (pnpm)
diff --git a/CODEOWNERS b/CODEOWNERS
new file mode 100644
index 0000000..0134e0f
--- /dev/null
+++ b/CODEOWNERS
@@ -0,0 +1,8 @@
+# BACKLOG P1-15 (CI-14): required reviewers for Gitea's branch-protection
+# "required approvals" setting to have anyone to assign. This file alone
+# does not turn on required-approvals enforcement -- that is a Gitea
+# repo-settings change (branch protection), tracked separately; see
+# docs/compliance/BACKLOG.md P1-15 ("required_approvals: 0").
+#
+# Gitea CODEOWNERS syntax matches GitHub's: path pattern, then owner(s).
+* @sax3l
diff --git a/next.config.mjs b/next.config.mjs
index 4cd9948..0728b76 100644
--- a/next.config.mjs
+++ b/next.config.mjs
@@ -1,3 +1,47 @@
+// BACKLOG P0-13 (SEC-06): the app previously shipped no security headers of
+// its own -- HSTS existed only as a platform default injected by Vercel, so
+// it would have silently disappeared on cutover to Coolify/Traefik (see
+// docs/architecture/ARCHITECTURE.md §5/§8). These are set here, at the
+// framework level, so they travel with the app regardless of host.
+//
+// CSP is same-origin-only (`'self'`) plus the minimum carve-outs this app
+// actually needs today:
+//   - `'unsafe-inline'` on script-src/style-src: Next.js's App Router injects
+//     small inline hydration/RSC payload scripts and Tailwind can emit
+//     inline style attributes; this repo doesn't yet wire a per-request
+//     nonce through middleware+layout (a real follow-up -- see BACKLOG --
+//     but out of scope for this pass, which fixes "zero headers", not "zero
+//     inline script tolerance").
+//   - `form-action` allows Stripe's hosted Checkout domains: the payment
+//     flow (app/api/payments/[order_id]/deposit) does a full top-level
+//     redirect to a Stripe-hosted page, never an embedded iframe/script
+//     (grep-verified: no @stripe/stripe-js dependency, no client-side
+//     Stripe.js load anywhere in app/).
+// No other third-party origins are contacted from the browser (no
+// analytics, no next/font/google, no embedded widgets -- grep-verified).
+const securityHeaders = [
+  { key: "Strict-Transport-Security", value: "max-age=63072000; includeSubDomains; preload" },
+  { key: "X-Frame-Options", value: "DENY" },
+  { key: "X-Content-Type-Options", value: "nosniff" },
+  { key: "Referrer-Policy", value: "strict-origin-when-cross-origin" },
+  { key: "Permissions-Policy", value: "camera=(), microphone=(), geolocation=(), interest-cohort=()" },
+  {
+    key: "Content-Security-Policy",
+    value: [
+      "default-src 'self'",
+      "script-src 'self' 'unsafe-inline'",
+      "style-src 'self' 'unsafe-inline'",
+      "img-src 'self' data: blob:",
+      "font-src 'self' data:",
+      "connect-src 'self'",
+      "form-action 'self' https://checkout.stripe.com https://api.stripe.com",
+      "frame-ancestors 'none'",
+      "base-uri 'self'",
+      "object-src 'none'",
+    ].join("; "),
+  },
+]
+
 /** @type {import('next').NextConfig} */
 const nextConfig = {
   typescript: {
@@ -6,6 +50,14 @@ const nextConfig = {
   images: {
     unoptimized: true,
   },
+  async headers() {
+    return [
+      {
+        source: "/(.*)",
+        headers: securityHeaders,
+      },
+    ]
+  },
 }
 
 export default nextConfig