chore: improve storage/ implementation; use log(...) consistently (#473)

This PR tidies up primitives under storage/.

**Noop changes:**

* Promote logger implementation to top-level utility outside of agent/
* Use logger within storage primitives
* Cleanup doc strings and comments

**Functional changes:**

* Increase command history size to 10_000
* Remove unnecessary debounce implementation and ensure a session ID is
created only once per agent loop

---------

Signed-off-by: Thibault Sottiaux <tibo@openai.com>

codex-cli/src/utils/agent/platform-commands.ts

@@ -2,7 +2,7 @@
  * Utility functions for handling platform-specific commands
  */
 
-import { log } from "./log.js";
+import { log } from "../logger/log.js";
 
 /**
  * Map of Unix commands to their Windows equivalents