chore: repository hygiene for SOC 2 readiness

.github/CODEOWNERS

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+# Every path has an owner, so GitHub requests a review from the founders team
+# on each pull request.
+* @scadable/founders

.github/dependabot.yml

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+# Dependabot version updates. Weekly, at most five open pull requests per
+# ecosystem, and minor and patch updates grouped into one pull request per
+# ecosystem so they arrive together. A major update opens on its own, except
+# for GitHub Actions, where every update is grouped (see that entry).
+# Dependabot only opens pull requests; nothing in this file merges one.
+version: 2
+updates:
+  - package-ecosystem: "uv"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 5
+    commit-message:
+      prefix: "chore"
+      include: "scope"
+    groups:
+      uv-minor-and-patch:
+        patterns:
+          - "*"
+        update-types:
+          - "minor"
+          - "patch"
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 5
+    commit-message:
+      prefix: "chore"
+      include: "scope"
+    groups:
+      github-actions:
+        patterns:
+          - "*"

SECURITY.md

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+# Security policy
+
+## Reporting a vulnerability
+
+Please do not report security problems through public issues, discussions or
+pull requests.
+
+Email security@scadable.com with:
+
+- what you found, and where: the URL, endpoint or repository;
+- the steps to reproduce it;
+- the impact you think it has;
+- how we can reach you.
+
+We reply within five business days. When we confirm a problem, we rate its
+severity and fix it on the timeline that severity sets.
+
+SCADABLE does not run a bug bounty program.
+
+## Supported versions
+
+Only the default branch is supported. A fix is made there and reaches users in
+the next release or deploy.