ci: trim CI costs — drop macOS release builds, single Python version, path filters

- Rust Release: comment out 2x macOS targets ($0.062/min = 10x Linux rate)
- Fleet CI: reduce matrix from 3 Python versions to 3.12 only (6 → 2 runners)
- Fleet CI: add path filter so doc/launcher changes don't trigger fleet tests

Saves ~70% of Actions cost per push cycle.

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

Author: SwiftWing21

.github/workflows/ci.yml

@@ -3,8 +3,10 @@ name: Fleet CI
 on:
   push:
     branches: [main, dev]
+    paths: ['fleet/**', 'tests/**', '.github/workflows/ci.yml']
   pull_request:
     branches: [main]
+    paths: ['fleet/**', 'tests/**', '.github/workflows/ci.yml']
 
 env:
   FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true
@@ -14,7 +16,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest]
-        python-version: ['3.11', '3.12', '3.13']
+        python-version: ['3.12']
       fail-fast: false
 
     runs-on: ${{ matrix.os }}

.github/workflows/rust-release.yml

@@ -23,12 +23,13 @@ jobs:
           - os: windows-latest
             target: x86_64-pc-windows-msvc
             artifact: biged.exe
-          - os: macos-latest
-            target: x86_64-apple-darwin
-            artifact: biged
-          - os: macos-latest
-            target: aarch64-apple-darwin
-            artifact: biged
+          # macOS builds disabled — $0.062/min (10x Linux). Re-enable for stable releases.
+          # - os: macos-latest
+          #   target: x86_64-apple-darwin
+          #   artifact: biged
+          # - os: macos-latest
+          #   target: aarch64-apple-darwin
+          #   artifact: biged
 
     defaults:
       run: