Secret hiding now skips text that holds nothing secret-looking

Claude Code hides secrets such as passwords and keys from some text. It now first does a quick check, and if nothing in the text looks like a secret, it returns the text unchanged without running every rule. Before, every rule always ran. File reads also now reuse one shared 64 KiB memory buffer instead of creating a new one for each piece. The performance figures Claude Code collects now include free disk space and memory clean-up details.