6. Glossary — the words that trip people up

# 6. Glossary — the words that trip people up

| Term | Precise meaning |
|---|---|
| **the record** | the canonical on-disk store (`.meridians-local/record/`). The source of truth. |
| **projection / cache** | IndexedDB — a rebuildable view of the record. Never authoritative. |
| **master** | the sovereign instance that owns its record (localhost / Electron / canonical web). |
| **client** | a joined instance reached over a tunnel; renders synced state, holds no credentials. (Retired synonym: "clone".) |
| **the reducer** | the single, pure `(document, action) → document` writer. Shared browser+node. |
| **`applyLocalMutation`** | the one write path on the backend (gate → reduce → persist → echo). |
| **mirror** (`record-mirror`) | the renderer's write-through that keeps the record current from browser edits. |
| **reconcile / catch-up** | the safety nets that re-derive the cache from the record when they diverge. |
| **daemon** | the always-on Node process (Electron host) that owns the record and serves `/api/local/*`. |
| **Tier 0 / 1 / 2** | read queries / reducer actions / effect-operations — the drivable surface ([MCP manual](../../../generated/MCP_MANUAL.md)). |
| **Threads · Streams · Positions** | the three opinion layers the record maintains — settled long-horizon opinion (Fate) · present-day action + memory (World) · foresight, a live self-updating read of where the world is heading (Fate, no score). Their sum is the expert's opinion. |
| **the Program** | the daily maintainer of that opinion — Research → Opinion → Merge → Position on a cadence, manual or autopilot. |
| **Feed** | the editorial, timestamped record the Program emits — how the expert's opinion evolved, consumable by other people. |
| **Public / Private Domain** | the evidence and maintenance boundary: current cited web Research vs. deliberately supplied interview context and Reminder Notes; the same engine underneath. |

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