security: add the repository secret-scanning baseline

.githooks/pre-commit

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+#!/bin/sh
+# Enable per clone with: git config core.hooksPath .githooks
+set -eu
+
+if command -v mise >/dev/null 2>&1 && mise which gitleaks >/dev/null 2>&1; then
+  exec mise exec -- gitleaks git --pre-commit --redact --staged --verbose
+fi
+
+if command -v gitleaks >/dev/null 2>&1; then
+  exec gitleaks git --pre-commit --redact --staged --verbose
+fi
+
+printf '%s\n' "Gitleaks is required. Run 'mise install' or install Gitleaks 8.30.1." >&2
+exit 1

.github/workflows/security.yml

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+name: Security
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  secret-scan:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Scan committed history for secrets
+        uses: gitleaks/gitleaks-action@e0c47f4f8be36e29cdc102c57e68cb5cbf0e8d1e # v3.0.0
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITLEAKS_ENABLE_COMMENTS: "false"
+          GITLEAKS_ENABLE_SUMMARY: "false"
+          GITLEAKS_ENABLE_UPLOAD_ARTIFACT: "false"
+          GITLEAKS_VERSION: "8.30.1"

.gitleaks.toml

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+title = "tripod"
+minVersion = "8.30.1"
+
+[extend]
+useDefault = true

.mise.toml

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+[tools]
+gitleaks = "8.30.1"

SECURITY.md

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+# Security policy
+
+## Supported versions
+
+Tripod supports the current `main` branch.
+
+## Report a vulnerability
+
+Please use [GitHub's private vulnerability reporting](https://github.com/joryeugene/tripod/security/advisories/new) so the report stays private while it is investigated. Do not open a public issue for a suspected vulnerability.
+
+Include the affected version or commit, reproduction steps, expected impact, and any mitigation you have already tested. Please omit real credentials and sensitive personal data.
+
+## Local checks
+
+The native staged secret scan is opt-in:
+
+```text
+mise install
+git config core.hooksPath .githooks
+```