feat: add cargo-lock-manager skill for handling --locked flag issues

- Create skill to manage Cargo.lock updates
- Add scripts for checking and updating lock files
- Document common CI failure patterns and solutions

.opencode/skills/cargo-lock-manager/.gitignore

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+.env
+*.log

.opencode/skills/cargo-lock-manager/SKILL.md

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+---
+name: cargo-lock-manager
+description: |
+  Manages Cargo.lock file updates and resolves --locked flag issues in CI/CD.
+
+  Triggers when user mentions:
+  - "cargo test --locked failed"
+  - "cannot update the lock file"
+  - "Cargo.lock is out of date"
+  - "PR failed with --locked error"
+  - "fix Cargo.lock"
+---
+
+## Quick Usage (Already Configured)
+
+### Check Cargo.lock status
+```bash
+cd packages/desktop/src-tauri
+cargo check --locked 2>&1 | head -20
+```
+
+### Update Cargo.lock locally
+```bash
+cd packages/desktop/src-tauri
+cargo update --workspace
+```
+
+### Test with --locked after update
+```bash
+cd packages/desktop/src-tauri
+cargo test --locked
+```
+
+## Common Gotchas
+
+- The `--locked` flag prevents automatic updates to Cargo.lock, which is good for reproducible builds but fails when dependencies change.
+- PRs often fail because the lock file wasn't committed after dependency updates.
+- Running `cargo update` without `--workspace` may not update all workspace members.
+
+## When CI Fails with --locked
+
+### Option 1: Update lock file and commit (Recommended)
+```bash
+cd packages/desktop/src-tauri
+cargo update --workspace
+git add Cargo.lock
+git commit -m "chore: update Cargo.lock"
+git push
+```
+
+### Option 2: Use --offline flag (for air-gapped environments)
+```bash
+cargo test --manifest-path packages/desktop/src-tauri/Cargo.toml --offline
+```
+
+## First-Time Setup (If Not Configured)
+
+No setup required. This skill assumes:
+- Rust/Cargo is installed
+- You're in the openwork repository
+- The Tauri app is in `packages/desktop/src-tauri/`
+
+## Prevention Tips
+
+- Always run `cargo check` or `cargo build` after modifying `Cargo.toml` files
+- Include `Cargo.lock` changes in the same commit as dependency updates
+- Consider adding a pre-commit hook to verify lock file is up to date

.opencode/skills/cargo-lock-manager/scripts/check-lock.sh

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+#!/bin/bash
+# Check if Cargo.lock is up to date with --locked flag
+# Exit 0 if OK, exit 1 if needs update
+
+set -e
+
+CARGO_TOML="${1:-packages/desktop/src-tauri/Cargo.toml}"
+
+echo "🔍 Checking Cargo.lock status for: $CARGO_TOML"
+
+if cargo check --manifest-path "$CARGO_TOML" --locked 2>&1; then
+    echo "✅ Cargo.lock is up to date"
+    exit 0
+else
+    echo "❌ Cargo.lock needs update"
+    echo ""
+    echo "To fix, run:"
+    echo "  cd $(dirname "$CARGO_TOML") && cargo update --workspace"
+    exit 1
+fi

.opencode/skills/cargo-lock-manager/scripts/update-lock.sh

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+#!/bin/bash
+# Update Cargo.lock for the Tauri workspace
+
+set -e
+
+CARGO_TOML="${1:-packages/desktop/src-tauri/Cargo.toml}"
+WORKDIR=$(dirname "$CARGO_TOML")
+
+echo "📦 Updating Cargo.lock in: $WORKDIR"
+
+cd "$WORKDIR"
+cargo update --workspace
+
+echo ""
+echo "✅ Cargo.lock updated"
+echo "📝 Don't forget to commit the changes!"