docs(ai): require an epoch on the tail of helper-agent ids

A helper agent's session-context file is .ai/session-context.d/<id>.org. A bare, reused id like "codex" makes the next run resolve to the previous run's leftover anchor, which it then mistakes for a crash to recover or clobbers. That bit on 2026-06-13: a codex run left codex.org for the next session to clean up.

The fix is a convention, not a resolver change. The spawner appends an epoch on the tail (host.project.runtime.<epoch>) so each run gets a fresh anchor. The epoch can't be minted inside session-context-path, since that resolver runs many times per session and must return the same path each call. I documented it in protocols.org, the wrap-up recommended-shape note, and the resolver header.

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