fix(ci): clean up runner config - pin all jobs to [self-hosted, linux, x64], remove continue-on-error and workaround comments

.gitea/workflows/ci.yml

@@ -1,14 +1,6 @@
 # kryz-go-flutter CI Pipeline
 # Triggers on push and pull_request
-# Stages: lint -> test -> build (Android + iOS) -> artifacts
+# Stages: lint -> test -> build (Android + iOS)
-#
-# IMPORTANT: Our self-hosted runners have different architectures:
-#   - "runner"       = x86_64 Linux (works for all jobs)
-#   - "Magrathea"    = ARM64 Mac running x86_64 Linux containers via Docker emulation
-# Both register as `ubuntu-latest` so jobs land randomly.
-# The x86_64 Flutter binary crashes on Magrathea under Rosetta emulation.
-# We use `continue-on-error: true` on lint/test so Magrathea failures don't block.
-# Android build detects non-Linux and succeeds as no-op.
 #
 # IMPORTANT: $GITHUB_PATH does NOT persist between steps in Gitea Actions/act.
 # Each step is a separate shell. We export PATH="$PWD/flutter/bin:$PATH" in
@@ -34,11 +26,10 @@ env:
   FLUTTER_VERSION: "3.44.0"
 
 jobs:
-  # ── Stage 1: Lint & static analysis (best-effort on any runner) ──
+  # ── Stage 1: Lint & static analysis ──
   lint:
     name: Lint
-    runs-on: ubuntu-latest
+    runs-on: [self-hosted, linux, x64]
-    continue-on-error: true
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -73,11 +64,10 @@ jobs:
           dart format lib/ test/
 
 
-  # ── Stage 1 (parallel): Unit & widget tests (best-effort) ───────
+  # ── Stage 1 (parallel): Unit & widget tests ──
   test:
     name: Test
-    runs-on: ubuntu-latest
+    runs-on: [self-hosted, linux, x64]
-    continue-on-error: true
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -109,7 +99,7 @@ jobs:
   # ── Stage 3: Android build ──────────────────────────────────────
   build-android:
     name: Build Android
-    runs-on: ubuntu-latest
+    runs-on: [self-hosted, linux, x64]
     needs: [lint, test]
     steps:
       - name: Checkout
@@ -217,7 +207,7 @@ jobs:
   # ── Stage 3 (parallel): iOS build ───────────────────────────────
   build-ios:
     name: Build iOS
-    runs-on: ubuntu-latest
+    runs-on: [self-hosted, linux, x64]
     needs: [lint, test]
     steps:
       - name: Checkout