diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index b133f07..7f29fc2 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -1 +1,2 @@
-* @recodeecom
+# Default code owners for repository-wide reviews.
+* @recodeecom @NagyVikt
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index ca79ca5..15e6d5d 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -1,5 +1,10 @@
 version: 2
 updates:
+  - package-ecosystem: npm
+    directory: /
+    schedule:
+      interval: weekly
+    versioning-strategy: lockfile-only
   - package-ecosystem: github-actions
     directory: /
     schedule:
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3ed02fe..bd1b16a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -4,6 +4,9 @@ on:
   push:
     branches:
       - main
+  pull_request:
+    branches:
+      - main
 
 permissions:
   contents: read
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 913bc03..078b1ad 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -4,6 +4,9 @@ on:
   push:
     branches:
       - main
+  pull_request:
+    branches:
+      - main
   schedule:
     - cron: '35 3 * * 1'
 
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index dc8b39b..eab0c25 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -1,4 +1,4 @@
-name: Release to npm (provenance)
+name: Release to npm (provenance + signed assets)
 
 on:
   workflow_dispatch:
@@ -14,6 +14,9 @@ jobs:
     if: github.repository == 'recodeee/gitguardex'
     runs-on: ubuntu-latest
     environment: npm
+    permissions:
+      contents: write
+      id-token: write
 
     steps:
       - name: Checkout
@@ -28,6 +31,9 @@ jobs:
           registry-url: https://registry.npmjs.org
           cache: npm
 
+      - name: Install Cosign
+        uses: sigstore/cosign-installer@cad07c2e89fa2edd6e2d7bab4c1aa38e53f76003 # v4.1.1
+
       - name: Install
         run: npm ci --ignore-scripts
 
@@ -55,6 +61,14 @@ jobs:
             echo "already_published=false" >> "$GITHUB_OUTPUT"
           fi
 
+      - name: Pack release tarball
+        id: pack
+        run: |
+          mkdir -p dist
+          package_file="$(npm pack --pack-destination dist | tail -n 1)"
+          echo "package_file=${package_file}" >> "$GITHUB_OUTPUT"
+          echo "package_path=dist/${package_file}" >> "$GITHUB_OUTPUT"
+
       - name: Publish with provenance
         if: ${{ steps.registry.outputs.already_published != 'true' }}
         run: npm publish --provenance --access public
@@ -65,3 +79,24 @@ jobs:
           PACKAGE_NAME: ${{ steps.pkg.outputs.name }}
           PACKAGE_VERSION: ${{ steps.pkg.outputs.version }}
         run: echo "${PACKAGE_NAME}@${PACKAGE_VERSION} is already on npm; skipping publish."
+
+      - name: Generate release checksum
+        run: |
+          sha256sum "${{ steps.pack.outputs.package_path }}" > "${{ steps.pack.outputs.package_path }}.sha256"
+
+      - name: Sign release tarball with Sigstore
+        run: |
+          cosign sign-blob "${{ steps.pack.outputs.package_path }}" \
+            --bundle "${{ steps.pack.outputs.package_path }}.sigstore.json" \
+            --yes
+
+      - name: Upload signed release assets
+        env:
+          GH_TOKEN: ${{ github.token }}
+          RELEASE_TAG: ${{ github.event.release.tag_name || format('v{0}', steps.pkg.outputs.version) }}
+        run: |
+          gh release upload "$RELEASE_TAG" \
+            "${{ steps.pack.outputs.package_path }}" \
+            "${{ steps.pack.outputs.package_path }}.sha256" \
+            "${{ steps.pack.outputs.package_path }}.sigstore.json" \
+            --clobber
diff --git a/SECURITY.md b/SECURITY.md
index 99d80c3..910fd2f 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -8,7 +8,7 @@ Only the latest published GitGuardex CLI build is supported for security fixes.
 
 Please report security issues privately by opening a GitHub security advisory:
 
-- https://github.com/recodeecom/multiagent-safety/security/advisories/new
+- https://github.com/recodeee/gitguardex/security/advisories/new
 
 If advisories are unavailable, open a private report via GitHub issue contact details and avoid posting exploit details publicly.
 
diff --git a/openspec/changes/agent-codex-harden-scorecard-best-practices-2026-04-23-18-42/.openspec.yaml b/openspec/changes/agent-codex-harden-scorecard-best-practices-2026-04-23-18-42/.openspec.yaml
new file mode 100644
index 0000000..8b394c6
--- /dev/null
+++ b/openspec/changes/agent-codex-harden-scorecard-best-practices-2026-04-23-18-42/.openspec.yaml
@@ -0,0 +1,2 @@
+schema: spec-driven
+created: 2026-04-23
diff --git a/openspec/changes/agent-codex-harden-scorecard-best-practices-2026-04-23-18-42/proposal.md b/openspec/changes/agent-codex-harden-scorecard-best-practices-2026-04-23-18-42/proposal.md
new file mode 100644
index 0000000..b14a451
--- /dev/null
+++ b/openspec/changes/agent-codex-harden-scorecard-best-practices-2026-04-23-18-42/proposal.md
@@ -0,0 +1,19 @@
+## Why
+
+- GitGuardex already ships several Scorecard-friendly guardrails, but key supply-chain signals still lag behind the repository's actual intent.
+- The release workflow publishes to npm with provenance but leaves GitHub releases without signed assets, so Scorecard cannot award signed-release credit.
+- CI and CodeQL do not run on pull requests to `main`, which weakens branch-protection hardening because there are no stable pre-merge checks to require.
+- Package metadata and security/reporting metadata still contain avoidable drift such as range-based dependency specifiers and a repo link that points elsewhere.
+
+## What Changes
+
+- Run CI and CodeQL for pull requests targeting `main` so required status checks have real pre-merge coverage.
+- Extend the release workflow to build the npm tarball, checksum it, sign it with a Sigstore bundle, and upload those artifacts to the matching GitHub release.
+- Expand Dependabot to cover npm packages and pin package dependency specifiers exactly in both `package.json` and `package-lock.json`.
+- Correct security-reporting and code-owner metadata needed for stricter GitHub review settings.
+
+## Impact
+
+- Affects GitHub Actions workflows, dependency metadata, and security/review docs only; runtime CLI behavior stays unchanged.
+- Signed-release score gains apply to future or re-run releases; historical releases without assets remain unchanged until republished or manually backfilled.
+- Branch-protection, maintained, contributors, and code-review scores still depend partly on live GitHub settings, repo age, and human review history outside this diff.
diff --git a/openspec/changes/agent-codex-harden-scorecard-best-practices-2026-04-23-18-42/specs/harden-scorecard-best-practices/spec.md b/openspec/changes/agent-codex-harden-scorecard-best-practices-2026-04-23-18-42/specs/harden-scorecard-best-practices/spec.md
new file mode 100644
index 0000000..5e10390
--- /dev/null
+++ b/openspec/changes/agent-codex-harden-scorecard-best-practices-2026-04-23-18-42/specs/harden-scorecard-best-practices/spec.md
@@ -0,0 +1,45 @@
+## ADDED Requirements
+
+### Requirement: Pull request checks for protected main
+The repository SHALL run CI and CodeQL workflows on pull requests targeting `main` so branch-protection rules can require real pre-merge status checks.
+
+#### Scenario: CI runs on pull requests
+- **WHEN** a pull request targets `main`
+- **THEN** `.github/workflows/ci.yml` triggers for that pull request
+- **AND** the workflow remains enabled for direct pushes to `main`.
+
+#### Scenario: CodeQL runs on pull requests
+- **WHEN** a pull request targets `main`
+- **THEN** `.github/workflows/codeql.yml` triggers for that pull request
+- **AND** the scheduled scan remains enabled.
+
+### Requirement: Signed GitHub release assets
+The release workflow SHALL publish signed GitHub release assets for the package tarball in addition to npm provenance.
+
+#### Scenario: Release uploads signed artifacts
+- **WHEN** `.github/workflows/release.yml` runs for a published release
+- **THEN** it builds the npm tarball, generates a SHA256 checksum, creates a Sigstore bundle for the tarball, and uploads those files to the matching GitHub release
+- **AND** the workflow continues to publish to npm with provenance when the version is not already published.
+
+### Requirement: Pinned dependency and update metadata
+The repository SHALL keep supply-chain metadata aligned with stricter Scorecard expectations.
+
+#### Scenario: Package specs stay exact
+- **WHEN** runtime or dev dependencies are declared in `package.json`
+- **THEN** their versions are pinned exactly
+- **AND** `package-lock.json` reflects those exact specifiers.
+
+#### Scenario: Automated update coverage includes npm
+- **WHEN** Dependabot configuration is evaluated
+- **THEN** it schedules updates for both npm dependencies and GitHub Actions.
+
+### Requirement: Security and ownership metadata points at this repository
+Repository security and ownership metadata SHALL reference the live GitGuardex repository surfaces.
+
+#### Scenario: Security reporting points at this repo
+- **WHEN** maintainers or users read `SECURITY.md`
+- **THEN** the private advisory link targets `recodeee/gitguardex`.
+
+#### Scenario: Code owners cover default review paths
+- **WHEN** repository-wide ownership is evaluated
+- **THEN** `.github/CODEOWNERS` defines default owners for all files.
diff --git a/openspec/changes/agent-codex-harden-scorecard-best-practices-2026-04-23-18-42/tasks.md b/openspec/changes/agent-codex-harden-scorecard-best-practices-2026-04-23-18-42/tasks.md
new file mode 100644
index 0000000..0d270cd
--- /dev/null
+++ b/openspec/changes/agent-codex-harden-scorecard-best-practices-2026-04-23-18-42/tasks.md
@@ -0,0 +1,34 @@
+## Definition of Done
+
+This change is complete only when **all** of the following are true:
+
+- Every checkbox below is checked.
+- The agent branch reaches `MERGED` state on `origin` and the PR URL + state are recorded in the completion handoff.
+- If any step blocks (test failure, conflict, ambiguous result), append a `BLOCKED:` line under section 4 explaining the blocker and **STOP**. Do not tick remaining cleanup boxes; do not silently skip the cleanup pipeline.
+
+## Handoff
+
+- Handoff: change=`agent-codex-harden-scorecard-best-practices-2026-04-23-18-42`; branch=`agent/codex/harden-scorecard-best-practices-2026-04-23-18-42`; scope=`Scorecard-facing workflows, dependency metadata, and security/review docs`; action=`finish repo-side hardening, then apply and verify reachable GitHub settings`.
+- Copy prompt: Continue `agent-codex-harden-scorecard-best-practices-2026-04-23-18-42` on branch `agent/codex/harden-scorecard-best-practices-2026-04-23-18-42`. Work inside the existing sandbox, review `openspec/changes/agent-codex-harden-scorecard-best-practices-2026-04-23-18-42/tasks.md`, continue from the current state instead of creating a new sandbox, and when the work is done run `gx branch finish --branch agent/codex/harden-scorecard-best-practices-2026-04-23-18-42 --base main --via-pr --wait-for-merge --cleanup`.
+
+## 1. Specification
+
+- [x] 1.1 Finalize proposal scope and acceptance criteria for `agent-codex-harden-scorecard-best-practices-2026-04-23-18-42`.
+- [x] 1.2 Define normative requirements in `specs/harden-scorecard-best-practices/spec.md`.
+
+## 2. Implementation
+
+- [x] 2.1 Implement scoped behavior changes.
+- [x] 2.2 Add/update focused regression coverage.
+
+## 3. Verification
+
+- [x] 3.1 Run targeted project verification commands.
+- [x] 3.2 Run `openspec validate agent-codex-harden-scorecard-best-practices-2026-04-23-18-42 --type change --strict`.
+- [x] 3.3 Run `openspec validate --specs`.
+
+## 4. Cleanup (mandatory; run before claiming completion)
+
+- [ ] 4.1 Run the cleanup pipeline: `gx branch finish --branch agent/codex/harden-scorecard-best-practices-2026-04-23-18-42 --base main --via-pr --wait-for-merge --cleanup`. This handles commit -> push -> PR create -> merge wait -> worktree prune in one invocation.
+- [ ] 4.2 Record the PR URL and final merge state (`MERGED`) in the completion handoff.
+- [ ] 4.3 Confirm the sandbox worktree is gone (`git worktree list` no longer shows the agent path; `git branch -a` shows no surviving local/remote refs for the branch).
diff --git a/package-lock.json b/package-lock.json
index 3ab1c30..ded780e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,8 +9,8 @@
       "version": "7.0.26",
       "license": "MIT",
       "dependencies": {
-        "jsonc-parser": "^3.3.1",
-        "semver": "^7.7.4"
+        "jsonc-parser": "3.3.1",
+        "semver": "7.7.4"
       },
       "bin": {
         "gitguardex": "bin/multiagent-safety.js",
@@ -19,7 +19,7 @@
         "multiagent-safety": "bin/multiagent-safety.js"
       },
       "devDependencies": {
-        "fast-check": "^3.23.2"
+        "fast-check": "3.23.2"
       },
       "engines": {
         "node": ">=18"
diff --git a/package.json b/package.json
index fdfb498..0af7dd1 100644
--- a/package.json
+++ b/package.json
@@ -68,10 +68,10 @@
     "access": "public"
   },
   "devDependencies": {
-    "fast-check": "^3.23.2"
+    "fast-check": "3.23.2"
   },
   "dependencies": {
-    "jsonc-parser": "^3.3.1",
-    "semver": "^7.7.4"
+    "jsonc-parser": "3.3.1",
+    "semver": "7.7.4"
   }
 }
diff --git a/test/metadata.test.js b/test/metadata.test.js
index 7908da1..15dfc12 100644
--- a/test/metadata.test.js
+++ b/test/metadata.test.js
@@ -32,6 +32,7 @@ test('release workflow publishes with provenance in CI', () => {
   const workflow = fs.readFileSync(workflowPath, 'utf8');
   assert.match(workflow, /name:\s+Checkout\s+uses:\s+actions\/checkout@[0-9a-f]{40}[^\n]*\n\s+with:\s*\n\s+fetch-depth:\s+0/s);
   assert.match(workflow, /npm publish --provenance --access public/);
+  assert.match(workflow, /name:\s+Install Cosign\s+uses:\s+sigstore\/cosign-installer@[0-9a-f]{40}[^\n]*# v4\.1\.1/s);
 });
 
 test('release workflow skips publish when the current version is already on npm', () => {
@@ -45,6 +46,19 @@ test('release workflow skips publish when the current version is already on npm'
   assert.match(workflow, /skipping publish\./);
 });
 
+test('release workflow uploads signed GitHub release assets for the package tarball', () => {
+  const workflowPath = path.join(repoRoot, '.github', 'workflows', 'release.yml');
+  const workflow = fs.readFileSync(workflowPath, 'utf8');
+  assert.match(workflow, /name:\s+Pack release tarball/);
+  assert.match(workflow, /npm pack --pack-destination dist/);
+  assert.match(workflow, /sha256sum "\$\{\{\s*steps\.pack\.outputs\.package_path\s*\}\}" > "\$\{\{\s*steps\.pack\.outputs\.package_path\s*\}\}\.sha256"/);
+  assert.match(workflow, /cosign sign-blob "\$\{\{\s*steps\.pack\.outputs\.package_path\s*\}\}"/);
+  assert.match(workflow, /--bundle "\$\{\{\s*steps\.pack\.outputs\.package_path\s*\}\}\.sigstore\.json"/);
+  assert.match(workflow, /name:\s+Upload signed release assets/);
+  assert.match(workflow, /GH_TOKEN:\s+\$\{\{\s*github\.token\s*\}\}/);
+  assert.match(workflow, /gh release upload "\$RELEASE_TAG"/);
+});
+
 test('release workflow only publishes from published releases or manual dispatch', () => {
   const workflowPath = path.join(repoRoot, '.github', 'workflows', 'release.yml');
   const workflow = fs.readFileSync(workflowPath, 'utf8');
@@ -129,6 +143,13 @@ test('security workflows are present and use pinned GitHub Actions SHAs', () =>
   }
 });
 
+test('CI and CodeQL workflows run on pull requests targeting main', () => {
+  const ciWorkflow = fs.readFileSync(path.join(repoRoot, '.github', 'workflows', 'ci.yml'), 'utf8');
+  const codeqlWorkflow = fs.readFileSync(path.join(repoRoot, '.github', 'workflows', 'codeql.yml'), 'utf8');
+  assert.match(ciWorkflow, /pull_request:\s*\n\s*branches:\s*\n\s*-\s*main/s);
+  assert.match(codeqlWorkflow, /pull_request:\s*\n\s*branches:\s*\n\s*-\s*main/s);
+});
+
 test('code review workflow does not gate startup on secrets context', () => {
   const workflowPath = path.join(repoRoot, '.github', 'workflows', 'cr.yml');
   const workflow = fs.readFileSync(workflowPath, 'utf8');
@@ -137,6 +158,35 @@ test('code review workflow does not gate startup on secrets context', () => {
   assert.match(workflow, /if:\s+\$\{\{\s*env\.OPENAI_API_KEY != ''\s*\}\}/);
 });
 
+test('security metadata points at the live repo and dependabot covers npm plus actions', () => {
+  const securityPolicy = fs.readFileSync(path.join(repoRoot, 'SECURITY.md'), 'utf8');
+  const dependabot = fs.readFileSync(path.join(repoRoot, '.github', 'dependabot.yml'), 'utf8');
+  const codeowners = fs.readFileSync(path.join(repoRoot, '.github', 'CODEOWNERS'), 'utf8');
+
+  assert.match(securityPolicy, /https:\/\/github\.com\/recodeee\/gitguardex\/security\/advisories\/new/);
+  assert.match(dependabot, /package-ecosystem:\s+npm/);
+  assert.match(dependabot, /package-ecosystem:\s+github-actions/);
+  assert.match(dependabot, /versioning-strategy:\s+lockfile-only/);
+  assert.match(codeowners, /^# Default code owners/m);
+  assert.match(codeowners, /^\*\s+@recodeecom\s+@NagyVikt$/m);
+});
+
+test('package manifest pins runtime and dev dependency versions exactly', () => {
+  const pkg = JSON.parse(fs.readFileSync(packageJsonPath, 'utf8'));
+  const lockfile = fs.readFileSync(path.join(repoRoot, 'package-lock.json'), 'utf8');
+
+  for (const sectionName of ['dependencies', 'devDependencies']) {
+    const section = pkg[sectionName] || {};
+    for (const [name, version] of Object.entries(section)) {
+      assert.doesNotMatch(version, /^[~^]/, `${sectionName}.${name} must stay pinned exactly`);
+    }
+  }
+
+  assert.match(lockfile, /"jsonc-parser": "3\.3\.1"/);
+  assert.match(lockfile, /"semver": "7\.7\.4"/);
+  assert.match(lockfile, /"fast-check": "3\.23\.2"/);
+});
+
 test('frontend mirror workflow skips cleanly when the mirror PAT is missing', () => {
   const workflowPath = path.join(repoRoot, '.github', 'workflows', 'sync-frontend-mirror.yml');
   const workflow = fs.readFileSync(workflowPath, 'utf8');