ci: fix unresolvable setup-beam pins in 21 hypatia-scan.yml (Refs #64) (#75)

Loosens elixir `1.19.4`→`1.18` / otp `28.3`→`27` across **21**
`hypatia-scan.yml` copies in this repo (a2ml/, k9-svc/, bindings, etc.).
The bad pins are absent from the setup-beam index, so the dogfooding job
failed in ~12s on every run, masking real CI signal.

The root `.github/workflows/hypatia-scan.yml` was already corrected;
this propagates the same fix to the remaining 21.

Companion PRs fix the generator source (rsr-template-repo /
v3-templater) so newly-generated repos no longer inherit the bad pin.

Refs #64 — `Refs` not `Closes` per #66;
joint-close only on agreement.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: hyperpolymath <hyperpolymath@users.noreply.github.com>
Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

Author: hyperpolymath

0-ai-gatekeeper-protocol/.github/workflows/hypatia-scan.yml

@@ -27,8 +27,8 @@ jobs:
       - name: Setup Elixir for Hypatia scanner
         uses: erlef/setup-beam@2f0cc07b4b9bea248ae098aba9e1a8a1de5ec24c # v1.18.2
         with:
-          elixir-version: '1.19.4'
-          otp-version: '28.3'
+          elixir-version: '1.18'
+          otp-version: '27'
 
       - name: Clone Hypatia
         run: |

0-ai-gatekeeper-protocol/mcp-repo-guardian/.github/workflows/hypatia-scan.yml

@@ -27,8 +27,8 @@ jobs:
       - name: Setup Elixir for Hypatia scanner
         uses: erlef/setup-beam@2f0cc07b4b9bea248ae098aba9e1a8a1de5ec24c # v1.18.2
         with:
-          elixir-version: '1.19.4'
-          otp-version: '28.3'
+          elixir-version: '1.18'
+          otp-version: '27'
 
       - name: Clone Hypatia
         run: |

0-ai-gatekeeper-protocol/repo-guardian-fs/.github/workflows/hypatia-scan.yml

@@ -27,8 +27,8 @@ jobs:
       - name: Setup Elixir for Hypatia scanner
         uses: erlef/setup-beam@2f0cc07b4b9bea248ae098aba9e1a8a1de5ec24c # v1.18.2
         with:
-          elixir-version: '1.19.4'
-          otp-version: '28.3'
+          elixir-version: '1.18'
+          otp-version: '27'
 
       - name: Clone Hypatia
         run: |

a2ml/.github/workflows/hypatia-scan.yml

@@ -27,8 +27,8 @@ jobs:
       - name: Setup Elixir for Hypatia scanner
         uses: erlef/setup-beam@2f0cc07b4b9bea248ae098aba9e1a8a1de5ec24c # v1.18.2
         with:
-          elixir-version: '1.19.4'
-          otp-version: '28.3'
+          elixir-version: '1.18'
+          otp-version: '27'
 
       - name: Clone Hypatia
         run: |

a2ml/actions/validate/.github/workflows/hypatia-scan.yml

@@ -27,8 +27,8 @@ jobs:
       - name: Setup Elixir for Hypatia scanner
         uses: erlef/setup-beam@e6d7c94229049569db56a7ad5a540c051a010af9 # v1.18.2
         with:
-          elixir-version: '1.19.4'
-          otp-version: '28.3'
+          elixir-version: '1.18'
+          otp-version: '27'
 
       - name: Clone Hypatia
         run: |

a2ml/bindings/deno/.github/workflows/hypatia-scan.yml

@@ -27,8 +27,8 @@ jobs:
       - name: Setup Elixir for Hypatia scanner
         uses: erlef/setup-beam@e6d7c94229049569db56a7ad5a540c051a010af9 # v1.18.2
         with:
-          elixir-version: '1.19.4'
-          otp-version: '28.3'
+          elixir-version: '1.18'
+          otp-version: '27'
 
       - name: Clone Hypatia
         run: |

a2ml/bindings/haskell/.github/workflows/hypatia-scan.yml

@@ -27,8 +27,8 @@ jobs:
       - name: Setup Elixir for Hypatia scanner
         uses: erlef/setup-beam@e6d7c94229049569db56a7ad5a540c051a010af9 # v1.18.2
         with:
-          elixir-version: '1.19.4'
-          otp-version: '28.3'
+          elixir-version: '1.18'
+          otp-version: '27'
 
       - name: Clone Hypatia
         run: |

a2ml/bindings/rust/.github/workflows/hypatia-scan.yml

@@ -27,8 +27,8 @@ jobs:
       - name: Setup Elixir for Hypatia scanner
         uses: erlef/setup-beam@e6d7c94229049569db56a7ad5a540c051a010af9 # v1.18.2
         with:
-          elixir-version: '1.19.4'
-          otp-version: '28.3'
+          elixir-version: '1.18'
+          otp-version: '27'
 
       - name: Clone Hypatia
         run: |

a2ml/editors/vscode/.github/workflows/hypatia-scan.yml

@@ -27,8 +27,8 @@ jobs:
       - name: Setup Elixir for Hypatia scanner
         uses: erlef/setup-beam@e6d7c94229049569db56a7ad5a540c051a010af9 # v1.18.2
         with:
-          elixir-version: '1.19.4'
-          otp-version: '28.3'
+          elixir-version: '1.18'
+          otp-version: '27'
 
       - name: Clone Hypatia
         run: |

a2ml/pandoc/.github/workflows/hypatia-scan.yml

@@ -27,8 +27,8 @@ jobs:
       - name: Setup Elixir for Hypatia scanner
         uses: erlef/setup-beam@e6d7c94229049569db56a7ad5a540c051a010af9 # v1.18.2
         with:
-          elixir-version: '1.19.4'
-          otp-version: '28.3'
+          elixir-version: '1.18'
+          otp-version: '27'
 
       - name: Clone Hypatia
         run: |