Avoid-Creating-New-Files Instruction Softening

Description

Observed evolution of the Claude Code system prompt: the 'avoid creating new files' rule has been progressively softened from a hard rule ('don't create new files unless explicitly asked') to a preference ('prefer editing existing files over creating new ones'). Surfaced by cchistory/Piebald diffs; cited as evidence that the prompt has drifted away from user-protective defaults.

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src-20260423-22e662f6932a