docs: update backlog tasks

Author: pythoninthegrass

backlog/tasks/task-014 - Investigate-runtime-caching-not-working-in-iOS-CI-workflow.md

@@ -0,0 +1,39 @@
+---
+id: task-014
+title: Investigate runtime caching not working in iOS CI workflow
+status: To Do
+assignee: []
+created_date: '2025-12-18 00:11'
+labels:
+  - ci
+  - performance
+  - github-actions
+dependencies: []
+priority: low
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+The GitHub Actions iOS build workflow has caching configured for Ruby (bundler-cache), Node.js (npm cache), and Rust (Cargo cache), but they may not be working effectively.
+
+## Current caching setup in `.github/workflows/build-ios-app.yml`:
+- **Ruby:** `ruby/setup-ruby@v1` with `bundler-cache: true`
+- **Node.js:** `actions/setup-node@v4` with `cache: 'npm'`
+- **Rust/Cargo:** Manual `actions/cache@v4` for `~/.cargo/` and `src-tauri/target/`
+
+## Investigation needed:
+1. Check GitHub Actions logs for cache hit/miss status
+2. Verify cache keys are stable across runs
+3. Confirm cached paths exist and contain expected content
+4. Check if `macos-latest` runner changes affect cache invalidation
+5. Review Cargo cache - may need to exclude incremental compilation artifacts
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [ ] #1 Ruby gems cache shows 'cache hit' in subsequent runs
+- [ ] #2 Node modules cache shows 'cache hit' in subsequent runs
+- [ ] #3 Cargo cache shows 'cache hit' in subsequent runs
+- [ ] #4 Build times improve on cache hits vs cold builds
+<!-- AC:END -->