⚡ Bolt: [performance improvement] Optimize configuration loading for bulk worktree creations

[Donach]

💡 What

Updated WorktreesService.create() to invoke loadConfig() a single time before mapping over array inputs. The loaded configuration is passed to the updated applyWorktreeCreateDefaults method.

🎯 Why

During bulk inserts (via Promise.all + .map()), loadConfig() was being called on every array iteration. Since loadConfig() reads and parses the config.yaml file on every invocation, this resulted in $O(N)$ unnecessary asynchronous disk reads and YAML parsing, dragging down performance significantly as array sizes scale.

📊 Impact

Reduces disk I/O and configuration parsing from $O(N)$ to $O(1)$ for bulk worktree creations. Prevents synchronous blocking (from the Drizzle/DB adapters mapping fast while disk I/O stacks up).

🔬 Measurement

Run pnpm --filter @agor/daemon test -- src/services/worktrees.test.ts to verify backward compatibility and no regressions. The change handles both single object creation and array creation optimally.

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PR created automatically by Jules for task 10500225037097914979 started by @Donach

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