Create logger-refactor-plan.md

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Co-Authored-By: Codebuff <noreply@codebuff.com>

Author: charleslien

plans/logger-refactor-plan.md

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+## Plan: Refactor Logger to Pass as Parameter
+
+### Step 1: Search for logger imports
+- Use `code_search` with pattern `import \{ logger` (escape curly braces)
+- Set `cwd: "backend"` to limit search scope
+- Exclude websocket-action.ts files
+
+### Step 2: For each file (except websocket-action.ts)
+- Remove the `import { logger }` line
+- Refactor function signature to use single `params` object containing all arguments including `logger: Logger`
+- Import proper type: `import type { Logger } from '@codebuff/types/logger'`
+  - Don't manually type as `{ debug: Function; ... }` - will fail typecheck
+- Add destructuring at top of function body to extract params
+
+### Step 3: Update all callers
+- **Always run full `bun run typecheck`** (not head/tail!) to find ALL errors
+- Update function calls to pass object with named properties
+- For tests: create mock logger constant with all 5 methods (debug, info, warn, error, fatal)
+- Use `allowMultiple: true` in str_replace when updating multiple calls in same file
+- **Check carefully** - there may be multiple call sites in the same file!
+- Repeat typecheck until ALL errors resolved
+
+### Step 4: Commit changes
+- **Do NOT use git-committer agent** - it's too slow
+- Instead, manually run: `git add <files>` then `git commit -m "<message>"`
+- Keep commit message concise but descriptive
+- Include Codebuff footer in commit message