fix(tests): stub all redirect targets in authoring tests; remove CLI self-redirects

CLI reference pages are now synthetic (generated from schema) rather than
physical files. The authoring test framework's copyTargetsFromRealDocsIntoMock
was guarded by `File.Exists` which skips synthetic targets, causing redirect
validation to fail for all tests that load the real _redirects.yml.

- Remove the File.Exists guard so stubs are added for all local redirect
  targets; synthetic page validity is checked by the production build
- Remove 9 no-op self-redirects (cli/changelog/*.md → same) and the
  cli/assembler/index.md self-redirect

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

Author: Mpdreamz

docs/_redirects.yml

@@ -14,23 +14,13 @@ redirects:
   'cli/release/changelog-remove.md': 'cli/changelog/remove.md'
   'cli/release/changelog-render.md': 'cli/changelog/render.md'
   'cli/release/index.md': 'cli/changelog/index.md'
-  # Old hand-written CLI page redirects → generated pages
-  'cli/changelog/add.md': 'cli/changelog/add.md'
-  'cli/changelog/bundle.md': 'cli/changelog/bundle.md'
-  'cli/changelog/bundle-amend.md': 'cli/changelog/bundle-amend.md'
-  'cli/changelog/evaluate-pr.md': 'cli/changelog/evaluate-pr.md'
-  'cli/changelog/gh-release.md': 'cli/changelog/gh-release.md'
-  'cli/changelog/init.md': 'cli/changelog/init.md'
-  'cli/changelog/remove.md': 'cli/changelog/remove.md'
-  'cli/changelog/render.md': 'cli/changelog/render.md'
   'cli/docset/index.md': 'cli/index.md'
   'cli/docset/build.md': 'cli/build.md'
   'cli/docset/diff-validate.md': 'cli/diff.md'
   'cli/docset/format.md': 'cli/format.md'
   'cli/docset/index-command.md': 'cli/cmd-index.md'
   'cli/docset/mv.md': 'cli/mv.md'
   'cli/docset/serve.md': 'cli/serve.md'
-  'cli/assembler/index.md': 'cli/assembler/index.md'
   'cli/assembler/assemble.md': 'cli/assemble.md'
   'cli/assembler/assembler-build.md': 'cli/assembler/build.md'
   'cli/assembler/assembler-clone.md': 'cli/assembler/clone.md'

tests/authoring/Framework/Setup.fs

@@ -162,11 +162,11 @@ navigation_title: Stub
             let destPath = Path.Combine(mockDocsRoot, normalized)
 
             // Tests supply their own minimal pages; do not replace them with production content.
+            // Always add a stub for any local redirect target not already present — this covers both
+            // physical pages and synthetic pages (e.g. CLI reference pages generated from a schema).
+            // Actual redirect correctness is validated by the production build, not authoring tests.
             if not (fileSystem.File.Exists destPath) then
-                let sourcePath = Path.Combine(repoRoot, "docs", normalized)
-
-                if File.Exists sourcePath then
-                    fileSystem.AddFile(destPath, MockFileData(stubMarkdown)))
+                fileSystem.AddFile(destPath, MockFileData(stubMarkdown)))
 
 [<AutoOpen>]
 type TestFile =