chore(ci): relax codecov patch check to 85% floor + informational

Codecov was set to target: auto with a 1% threshold on both project
and patch, so every PR had to stay within 1% of the current ~95%
project coverage. That ratchets tighter each time new easily-tested
code is added, and penalises PRs that touch editor-window callbacks
or polling loops which are not cleanly unit-testable.

Switch to a fixed 85% floor with 2% threshold on both checks, and
mark the patch check informational so the Codecov comment still
surfaces dropped lines (useful for review) but does not block merge.
The project check still guards against real regressions.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>
Signed-off-by: JasonXuDeveloper - 傑 <jason@xgamedev.net>

Author: JasonXuDeveloper

codecov.yml

@@ -5,12 +5,23 @@ coverage:
   status:
     project:
       default:
-        target: auto
-        threshold: 1%
+        # Floor at 85% so normal drift (a few hard-to-unit-test editor paths)
+        # does not fail the check. Base project is ~95%, so there is plenty of
+        # headroom without ratcheting it tighter on every PR.
+        target: 85%
+        threshold: 2%
     patch:
       default:
-        target: auto
-        threshold: 1%
+        # Same 85% floor for added/changed lines. Editor-window callbacks
+        # (OnFocus, polling schedule) are not cleanly unit-testable, so we
+        # accept a handful of uncovered lines per PR instead of chasing
+        # auto-vs-base noise.
+        target: 85%
+        threshold: 2%
+        # Informational: show the comment (so reviewers see where coverage
+        # dropped) but never block the merge. The project check above still
+        # guards against real regressions.
+        informational: true
 
 # Fix Docker container path prefix in coverage reports
 # Unity test runner generates paths like /github/workspace/UnityProject/...