chore(ci): drop the Codecov upload step (app uninstalled estate-wide) (#213)

chore(ci): drop the Codecov upload step from the repo template and wiki
examples

The Codecov GitHub App was uninstalled from this estate (owner ruling,
2026-09-20 audit);
these were the last references to it in this repository. Coverage
generation is unchanged —
only the upload to a service this org no longer uses is removed, so
scaffolded repos stop
inheriting a step that can never authorise.

No `.github/workflows/*.yml` file changes here, so no actions.lock
regeneration is due:
nothing in this diff can add or remove a lock-keyed `uses:` ref.

_Found by the estate ghost-app audit; part of the same sweep as the 40
merged PRs and `standards#885`._

Author: hyperpolymath

affinescript-ecosystem/affinescript/wiki/testing/guide.md

@@ -614,10 +614,7 @@ aspm coverage --format lcov --output coverage.lcov
 - name: Run tests with coverage
   run: aspm test --coverage
 
-- name: Upload coverage
-  uses: codecov/codecov-action@v3
-  with:
-    file: coverage.lcov
+# Coverage stays in-repo (coverage.lcov); no third-party uploader is configured.
 ```
 
 ---

affinescript-ecosystem/rattlescript/affinescript/wiki/testing/guide.md

@@ -614,10 +614,7 @@ aspm coverage --format lcov --output coverage.lcov
 - name: Run tests with coverage
   run: aspm test --coverage
 
-- name: Upload coverage
-  uses: codecov/codecov-action@v3
-  with:
-    file: coverage.lcov
+# Coverage stays in-repo (coverage.lcov); no third-party uploader is configured.
 ```
 
 ---