chore(docs): re-anchor the system-context census citation after the flow.zod line shift

`node scripts/check-system-context-census.mjs --fix` — pure line rot from the
guidance entries added above the cited line.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017RbbUMnxkUnWhE4j94v8FE

Author: os-sam

content/docs/permissions/system-context.mdx

@@ -193,7 +193,7 @@ assuming `isSystem` covers it is a documented source of bugs.
 
 | Assumption | Reality | Anchor |
 |:---|:---|:---|
-| "It suppresses triggers / record-change automation" | **No.** Only `skipTriggers` does. A bare `{ isSystem: true }` on a seed write re-fired automation on freshly seeded rows and wedged first boot | `metadata-protocol/src/seed-loader.ts:1971` (rationale at `:1881`–`1883`, #3760), `flow.zod.ts:685` |
+| "It suppresses triggers / record-change automation" | **No.** Only `skipTriggers` does. A bare `{ isSystem: true }` on a seed write re-fired automation on freshly seeded rows and wedged first boot | `metadata-protocol/src/seed-loader.ts:1971` (rationale at `:1881`–`1883`, #3760), `flow.zod.ts:702` |
 | "It skips the state machine" | **No.** That is `skipStateMachine`, carried by seed replay and by `treatAsHistorical` imports | `objectql/src/engine.ts` FSM gate; see [State Machine](/docs/protocol/objectql/state-machine) |
 | "It skips validation rules" | **No.** Field shape, `format`, `script` and the rest still run. The `readonly` strip runs *before* validation precisely so a discarded value is not judged | `objectql/src/engine.ts:9922`–`9939` |
 | "It preserves a supplied `updated_at` / `updated_by`" | **No.** That is `preserveAudit`, a separate opt-in — and an UPDATE-path exemption only | `field.zod.ts:1516` (#3493 / #6640) |