fix(ci): repoint codeql-action at a SHA that exists (#74)

`github/codeql-action@29b1f65c1f735799893313399435a59f54045865` is
pinned here but **exists in no repository** — the GitHub API returns 422
for it.

CodeQL therefore could not start: the run graph fails to build and the
job reports `startup_failure`, so this repository has had **no CodeQL
scanning at all**.

Repointed at `4187e74d05793876e9989daffde9c3e66b4acd07`, which is what
the `v3` tag currently resolves to (v3.37.3), verified against the API.

Found while auditing the estate: the same non-existent SHA was pinned in
**104 repositories**, so CodeQL was dead across nearly all of them.

----
## Summary by Gitar

- **Security & Compliance:**
    - Added `CODE_OF_CONDUCT.md` and removed duplicate `GOVERNANCE.adoc`
- Granted `actions: read` permission across workflow files for security
compliance


<sub>This will update automatically on new commits.</sub>

---------

Signed-off-by: Jonathan D.A. Jewell <6759885+hyperpolymath@users.noreply.github.com>
Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

Author: hyperpolymath

.github/workflows/casket-pages.yml

@@ -7,6 +7,7 @@ on:
   workflow_dispatch:
 
 permissions:
+  actions: read
   contents: read
   pages: write
   id-token: write

.github/workflows/codeql.yml

@@ -0,0 +1,45 @@
+# SPDX-License-Identifier: MPL-2.0
+name: CodeQL
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  schedule:
+    - cron: '0 0 * * 0'
+
+permissions:
+  actions: read
+  contents: read
+  security-events: write
+
+jobs:
+  analyze:
+    name: CodeQL Analysis
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - language: actions
+            build-mode: none
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@4187e74d05793876e9989daffde9c3e66b4acd07 # v3
+        with:
+          languages: ${{ matrix.language }}
+          build-mode: ${{ matrix.build-mode }}
+
+      - name: Autobuild
+        uses: github/codeql-action/autobuild@4187e74d05793876e9989daffde9c3e66b4acd07 # v3
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@4187e74d05793876e9989daffde9c3e66b4acd07 # v3

.github/workflows/governance.yml

@@ -27,6 +27,7 @@ concurrency:
   cancel-in-progress: true
 
 permissions:
+  actions: read
   contents: read
 
 jobs:

.github/workflows/hypatia-scan.yml

@@ -19,6 +19,7 @@ concurrency:
   cancel-in-progress: true
 
 permissions:
+  actions: read
   contents: read
   security-events: write
   pull-requests: write

.github/workflows/mirror.yml

@@ -7,6 +7,7 @@ on:
   workflow_dispatch:
 
 permissions:
+  actions: read
   contents: read
 
 jobs:

.github/workflows/pages.yml

@@ -5,6 +5,7 @@ on:
     branches: [main, master]
   workflow_dispatch:
 permissions:
+  actions: read
   contents: read
   pages: write
   id-token: write

.github/workflows/proof-corpus.yml

@@ -18,6 +18,7 @@ on:
     branches: [main, master]
 
 permissions:
+  actions: read
   contents: read
 
 concurrency:

.github/workflows/push-email-notify.yml

@@ -7,6 +7,7 @@ name: Push email notification
 on:
   push: {}
 permissions:
+  actions: read
   contents: read
 jobs:
   notify:

.github/workflows/rust-ci.yml

@@ -10,6 +10,7 @@ on:
   pull_request:
 
 permissions:
+  actions: read
   contents: read
 
 jobs:

.github/workflows/scorecard.yml

@@ -15,6 +15,7 @@ on:
 # `read-all` startup_failure seen estate-wide. Matches the canonical caller in
 # hyperpolymath/standards/.github/workflows/scorecard-reusable.yml.
 permissions:
+  actions: read
   contents: read
 
 jobs: