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* docs: map custom_instructions to --append-system-prompt (#1480) The v1 migration guide mapped the v0 `custom_instructions` input to `claude_args: --system-prompt`, but these have different semantics: `custom_instructions` *appended* to Claude Code's default system prompt, while `--system-prompt` *replaces* it entirely. Users who followed the guide silently lost the whole built-in system prompt (tool-usage guidance, sub-agent conventions, etc.), keeping only their few custom lines. Fixes #1480: - Map `custom_instructions` -> `--append-system-prompt` (matches v0 append semantics) in the deprecated-inputs table, the migration example, and the checklist. - Correct the claude_args options table: `--system-prompt` replaces the entire prompt; add an `--append-system-prompt` row for append behavior. Docs-only; no code changes. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * docs: fix remaining custom_instructions migration references (#1480) Update usage.md, faq.md, and configuration.md to map custom_instructions to --append-system-prompt, matching the migration-guide fix. The override_prompt row is left unchanged since replacement semantics may be intended there. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>