Todo persistence ignores T3CODE_HOME and hardcodes ~/.t3code #111

Problem

apps/server/src/todoPersistence.ts:7 hardcodes the todo data directory to Os.homedir() + "/.t3code":

export const T3CODE_DIR = Os.homedir() + "/.t3code";
export const TODOS_PATH = T3CODE_DIR + "/todos.json";
export const TODOS_ARCHIVE_PATH = T3CODE_DIR + "/todos-archive.json";

This ignores the T3CODE_HOME environment variable entirely. Every other persistence module in the codebase respects the configured base directory — todos is the only holdout.

Impact

AGENTS.md requires all dev instances to use isolated state directories:

Always run dev with an isolated home directory:

./scripts/dev.sh → sets T3CODE_HOME=~/.t3-hcode

When running an isolated dev server, the todo module reads and writes the user's real production todo file at ~/.t3code/todos.json. This:

• Corrupts the production data with test mutations
• Leaks production data into the dev session
• Violates the dev-isolation contract

Fix

Thread the configured base directory (from ServerConfig) through to todoPersistence.ts, matching the pattern used by every other persistence module:

export const readTodos = (config: { baseDir: string }) => ...

Or resolve T3CODE_DIR from ServerConfig.providerStatusCacheDir (or equivalent base-dir config key).