All agent configs use the same pattern: JSON array of file paths with
env var expansion. Remove unused features:
- Shell command execution via resolveStringPrompt (the `!cmd` prefix
path is kept as a trivial fallback but the 30s timeout/stderr
capture/cwd probing is gone)
- Prompt directory search (PromptsDirs, resolvePromptFile)
- Shell metacharacter detection guard
- Literal-text-if-contains-newline heuristic
- IsExec flag on Prompt type (both string and array now mean the same
thing: list of file paths)
207 + 49 → 104 + 38 lines (-114)
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