docs: add SECURITY.md

SECURITY.md

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+# Security Policy
+
+ClawRouter holds a wallet and signs real USDC payments, or spends a prepaid
+BlockRun account, so we take reports seriously. Thank you for helping keep its
+users safe.
+
+## Reporting a vulnerability
+
+Please report privately through GitHub:
+**[Report a vulnerability](https://github.com/BlockRunAI/ClawRouter/security/advisories/new)**
+(Security tab → "Report a vulnerability").
+
+If you cannot use GitHub, email **hello@blockrun.ai** with the subject
+"Security report". Do not open a public issue, pull request or discussion for
+a vulnerability.
+
+A useful report includes:
+
+- the affected version or commit
+- steps to reproduce, or a proof of concept
+- the impact you see (what an attacker can read, spend or change)
+
+## What to expect
+
+- **Acknowledgement within 48 hours.**
+- An assessment and a fix plan within 7 days of confirming the issue.
+- Fixes are developed in a private advisory fork and shipped in a patch
+  release. The advisory is published after the fixed version is on npm.
+
+## Supported versions
+
+Only the latest release on npm (`@blockrun/clawrouter@latest`) receives
+security fixes. Please upgrade before reporting.
+
+## Recognition
+
+We do not run a paid bug bounty. Reporters are credited by name in the
+published GitHub advisory and in the release notes, unless they ask to stay
+anonymous.
+
+## Scope
+
+In scope: this repository: the ClawRouter CLI, the local proxy (port 8402 by
+default), the OpenClaw plugin, and how they handle wallet keys, API keys,
+payments and spend limits.
+
+Out of scope: vulnerabilities in third-party models, gateways or chains
+ClawRouter talks to (report those to their owners); social engineering; and
+denial of service that needs local access to the user's machine.