gsd-docs-update

Flag handling rule:

• The optional flags documented below are available behaviors, not implied active behaviors
• A flag is active only when its literal token appears in $ARGUMENTS
• If a documented flag is absent from $ARGUMENTS, treat it as inactive
• --force: skip preservation prompts, regenerate all docs regardless of existing content or GSD markers
• --verify-only: check existing docs for accuracy against codebase, no generation (full verification requires Phase 4 verifier)
• If --force and --verify-only both appear in $ARGUMENTS, --force takes precedence

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