pscale_stream_engage

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ONE WRITE VERB — `say` — because a stream has no buffer to stage into: your reading lands in YOUR OWN mirror (<field>:<handle>) at the attended address, and a mirror is revisable by its holder forever, so stage and commit are one act. A STREAM STORES NOTHING: it composes over a spine-mirror-tree family that already exists (spine:<field>, the <field>:<handle> mirrors, the bare <field> fold), so it cannot drift from them and needs no lock of its own. This is the V-L-S envelope over that family: L is every mirror's reading AT the address, listed side by side and attributed — the SNAPSHOT, useful with no LLM in the room; S is the fold, which the CALLING mind synthesises from that snapshot under the operator's law delivered in the same envelope (the primitive never synthesises — no central resolver, as with pools). Reads deliver THE LADDER: every ancestor's voicing from the coarsest rung down to the attended one, so a located read arrives self-contextualised. `at` accepts 'now' on a temporal spine and COMPUTES the address from the clock — a human is never asked for an address (function:molequle:5); omit `at` entirely for the spine's map. A fold is ephemeral by default (tree:3 — recomputed on demand, never stale); `keep='personal'` lands it in history:<handle>, `keep='collective'` at the bare name <field> at the same address, endorsed by pointer and never a gate. Distinct from pscale_pool_engage, which owns a spool and a liquid buffer and serves windowed play; that primitive is unchanged and remains the RPG's.