feat(ai): add helper-mode workflow contract

helper-mode.org is the canonical home of the helper-instance rules: a second Claude alongside a live primary in the same project. It defines the four read/write tiers (always-safe reads and own-context writes, safe-by-discipline scoped single-heading edits, primary-only file-wide passes and all git mutation, escalation), the four data-integrity windows, the light startup, and the helper wrap-up (archive own context file, skip commit, with the git ban lifting only for an orphaned helper that ends up alone).

protocols.org gets a one-paragraph pointer, and INDEX.org gets a triggerless catalog entry like startup.org, so the no-trigger workflow clears the integrity check without a special case.

The contract is the canonical home. The routing that sends a session here (ai --helper, startup's roster branch, the wrap-up helper branch) ships behind the feature's drill gate and isn't live yet. Until then a session adopts it by an explicit "you are a helper" instruction.

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