chore: SECURITY.md + Dependabot config

.github/dependabot.yml

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+version: 2
+updates:
+  # Keep the GitHub Actions used by ci.yml / release.yml current.
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    commit-message:
+      prefix: "chore(ci)"
+    labels: ["dependencies", "github-actions"]
+
+  # Keep Python dependencies (runtime + dev) current.
+  - package-ecosystem: "pip"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    commit-message:
+      prefix: "chore(deps)"
+    labels: ["dependencies", "python"]

SECURITY.md

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+# Security Policy
+
+## Supported versions
+
+| Version | Supported |
+|---|---|
+| 0.1.x (latest) | ✅ |
+| 0.1.0 | ❌ — has a known harness-lock bypass; upgrade to **0.1.1+** |
+
+## Reporting a vulnerability
+
+Please report privately via GitHub's **"Report a vulnerability"** button on the
+repository's [Security tab](https://github.com/edarm92-arch/rm-tooling/security/advisories/new)
+— **do not open a public issue** for a suspected vulnerability.
+
+We aim to acknowledge a report within a few days and to release a fix (and a
+GitHub Security Advisory) once it is confirmed.
+
+## What counts as a security issue here
+
+rm-validate is a policy **harness**: its whole point is that its rules cannot be
+disabled by the code they govern. So, beyond ordinary code vulnerabilities, we
+treat as a **security issue** any way for a *target repo* to disable or bypass an
+integrity lock from its own configuration — for example:
+
+- silencing the capability-mismatch lock (declaring a capability `false` while
+  the code clearly has it),
+- hiding evidence from capability inference via configuration,
+- making a check report success (`exit 0`) without actually running,
+- neutralizing a check that is meant to be able to fail.
+
+`v0.1.1` fixed exactly this class of bug (the `inference.exclude` bypass). If you
+find another way to switch off or blind an integrity lock from a policy file,
+that is in scope — please report it privately.