ci: add Radar security scanning (secrets + SCA)

.github/workflows/security-scan.yml

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+# Security scanning via Radar CLI (EurekaDevSecOps/radarctl) — secrets (Gitleaks)
+# and SCA (Grype). SAST is intentionally left to the existing CodeQL workflow:
+# Radar's Opengrep SAST overlaps CodeQL and, on a CLI whose job is to spawn
+# processes (`capy run`, deploy adapters shelling to aws/wrangler, clipboard),
+# its command-injection rules fire on inherent, by-design behavior rather than
+# real vulnerabilities. So Radar here adds the coverage CodeQL does not:
+# secret scanning and dependency/SCA.
+#
+# Runs fully local: no EUREKA_AGENT_TOKEN is configured, so no findings leave
+# the runner. The gate enforces the "no criticals/highs to main" policy: radar
+# runs with `-t high`, so only high/critical findings fail the job — moderate
+# and low findings still print to the log for triage but do not block.
+#
+# Runs on ubuntu-latest (not the self-hosted CI runner) because Radar's
+# scanners run as Docker containers, which ubuntu-latest provides.
+name: Security Scan
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  radar:
+    name: Radar (secrets + SCA)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+
+      - name: Install Radar CLI
+        run: npm i -g @eurekadevsecops/radar
+
+      # Scans the repo. `-t high` fails the job only on high/critical findings
+      # (the "no criticals/highs to main" policy); moderate/low still print for
+      # triage. Gitleaks auto-loads the repo-root .gitleaks.toml allowlist.
+      - name: Run Radar scan (secrets + SCA)
+        run: radar scan -s "gitleaks,grype" -t high .

.gitleaks.toml

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+# Gitleaks configuration for capy-cli.
+#
+# Radar's secrets scanner (Gitleaks) runs `gitleaks dir <repo root>` in CI and
+# auto-loads this file. The default ruleset is kept in full (useDefault = true)
+# so real secrets in shipped code (src/, bin/, scripts/) still fail the gate.
+#
+# The test suite hardcodes intentional, obviously-fake credential-shaped
+# fixtures — dummy Stripe/connector keys, a throwaway RSA test key, sample
+# secret files — so tests can exercise parsing and encrypt/decrypt round-trips.
+# None are real secrets, so they must not fail the security gate. Allowlist the
+# tests/ tree only.
+
+[extend]
+useDefault = true
+
+[allowlist]
+description = "Test fixtures: intentional fake/example credentials used by the test suite (not real secrets)."
+paths = [
+  '''tests/.*''',
+]