fix: use only_modified instead of only_changed in CI workflows

The tj-actions/changed-files only_changed output does not include
deleted files, causing CI to be skipped when a PR only deletes
non-doc files. Switch to only_modified which correctly includes
deletions.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: k-rister

.github/workflows/cdm-ci.yaml

@@ -13,7 +13,7 @@ jobs:
   changes:
     runs-on: ubuntu-latest
     outputs:
-      only-docs: ${{ steps.filter.outputs.only_changed }}
+      only-docs: ${{ steps.filter.outputs.only_modified }}
     steps:
       - uses: actions/checkout@v4
       - uses: tj-actions/changed-files@v47

.github/workflows/crucible-ci.yaml

@@ -13,7 +13,7 @@ jobs:
   changes:
     runs-on: ubuntu-latest
     outputs:
-      only-docs: ${{ steps.filter.outputs.only_changed }}
+      only-docs: ${{ steps.filter.outputs.only_modified }}
     steps:
       - uses: actions/checkout@v4
       - uses: tj-actions/changed-files@v47