feat(scripts): add python dependabot pruner to fix-dependabot.sh (#460)

This PR adds a python script to prune invalid ecosystems from
dependabot.yml when running fix-dependabot.sh, addressing Type 1/2
validation errors across the estate.

---------

Signed-off-by: Jonathan D.A. Jewell <6759885+hyperpolymath@users.noreply.github.com>
Co-authored-by: Mistral Vibe <vibe@mistral.ai>

Author: hyperpolymath

.claude/worktrees/actions-policy

@@ -0,0 +1 @@
+Subproject commit 556f841e4e638555885ec15f28052223ecf849c1

.github/workflows/boj-build.yml

@@ -17,4 +17,5 @@ jobs:
           curl -X POST "http://boj-server.local:7700/cartridges/ssg-mcp/invoke"             -H "Content-Type: application/json"             -d "{\"repo\": \"${{ github.repository }}\", \"branch\": \"${{ github.ref_name }}\", \"engine\": \"casket\\"}"}
         continue-on-error: true
 permissions:
+  actions: read
   contents: read

.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

@@ -20,6 +20,7 @@ concurrency:
   cancel-in-progress: true
 
 permissions:
+  actions: read
   contents: read
 
 jobs:

.github/workflows/dogfood-gate.yml

@@ -13,6 +13,7 @@ on:
     branches: [main, master]
 
 permissions:
+  actions: read
   contents: read
 
 jobs:

.github/workflows/e2e.yml

@@ -6,6 +6,7 @@ on:
   pull_request:
     branches: ['**']
 permissions:
+  actions: read
   contents: read
 jobs:
   e2e:

.github/workflows/governance.yml

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

.github/workflows/hypatia-dispatch-intake.yml

@@ -11,6 +11,7 @@ on:
       - hypatia-general-findings
 
 permissions:
+  actions: read
   contents: read
 
 jobs:

.github/workflows/hypatia-scan.yml

@@ -21,6 +21,7 @@ concurrency:
   cancel-in-progress: true
 
 permissions:
+  actions: read
   contents: read
   security-events: write
   pull-requests: write

.github/workflows/instant-sync.yml

@@ -9,6 +9,7 @@ on:
     types: [published]
 
 permissions:
+  actions: read
   contents: read
 
 jobs: