docs(permissions): regenerate the system-context census from the merged tree

The merge brought in #16087, which inserted its own lines into `engine.ts` and
re-anchored this page for them. Both sides had edited this `merge=os-regen`
artifact, so the driver merged it with exit 0 while silently keeping one side;
`scripts/pm/os-regen-merge.sh` took main's bytes and this commit re-derives the
page from the merged tree with `pnpm gen:system-context-census`.

Blast radius measured, not assumed: 105 rows before and 105 after, row SET
identical once integers are normalised, 12 changed lines and all 12 identical
apart from line numbers — no row dropped, none added, no prose moved. The
deltas (+9/+12/+13/+14) are this branch's own cumulative insertion offsets.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01ARYe3yQTQCUFm5qPYNgKaJ

Author: claude

content/docs/permissions/system-context.mdx

@@ -109,17 +109,17 @@ that silently does not happen.
 
 | # | Behaviour when `isSystem` | Package | What you get / what you lose | Anchor |
 |:--|:---|:---|:---|:---|
-| 18 | **`readonly` strip bypassed — UPDATE, single row** | objectql | Get: a `readonly` field CAN be written. Lose: the protection that stops a caller seeding e.g. `approval_status` | `objectql/src/engine.ts:11688` |
-| 19 | **`readonly` strip bypassed — UPDATE, bulk/predicate** | objectql | Same, on the multi-row path | `objectql/src/engine.ts:11871` |
-| 20 | **`readonly` strip bypassed — INSERT** | objectql | Same, on create — one gate over BOTH create-side passes since the 2026-09-03 ruling moved the static-`readonly` strip in beside the runtime-owned one and deleted the DataProtocol ingress copy. `isSystem` is the **only** exemption on this path: `preserveAudit` is deliberately not read on create, so a non-system historical import is still stripped | `objectql/src/engine.ts:10336` |
-| 21 | Strict-drop refusal never fires | objectql | Lose: a caller that opted into loud refusal gets **silence** — strict refuses exactly what the strip would have taken, and the strip took nothing | `objectql/src/engine.ts:10469`, `readonly-strict-errors.ts:66` |
-| 22 | **Referential-integrity check skipped** | objectql | Get: writes proceed against unreachable/unresolvable targets. Lose: an `isSystem` caller can write a **dangling reference** | `objectql/src/engine.ts:6194` |
-| 23 | Tenant-audit warning silenced; `bypassTenantAudit` threaded to the driver | objectql | Get: unscoped system writes stop warning. Lose: the signal that would flag a genuine user-path scoping bug | `objectql/src/engine.ts:3922`, `:3932`, `:3959` |
+| 18 | **`readonly` strip bypassed — UPDATE, single row** | objectql | Get: a `readonly` field CAN be written. Lose: the protection that stops a caller seeding e.g. `approval_status` | `objectql/src/engine.ts:11746` |
+| 19 | **`readonly` strip bypassed — UPDATE, bulk/predicate** | objectql | Same, on the multi-row path | `objectql/src/engine.ts:11929` |
+| 20 | **`readonly` strip bypassed — INSERT** | objectql | Same, on create — one gate over BOTH create-side passes since the 2026-09-03 ruling moved the static-`readonly` strip in beside the runtime-owned one and deleted the DataProtocol ingress copy. `isSystem` is the **only** exemption on this path: `preserveAudit` is deliberately not read on create, so a non-system historical import is still stripped | `objectql/src/engine.ts:10394` |
+| 21 | Strict-drop refusal never fires | objectql | Lose: a caller that opted into loud refusal gets **silence** — strict refuses exactly what the strip would have taken, and the strip took nothing | `objectql/src/engine.ts:10527`, `readonly-strict-errors.ts:66` |
+| 22 | **Referential-integrity check skipped** | objectql | Get: writes proceed against unreachable/unresolvable targets. Lose: an `isSystem` caller can write a **dangling reference** | `objectql/src/engine.ts:6252` |
+| 23 | Tenant-audit warning silenced; `bypassTenantAudit` threaded to the driver | objectql | Get: unscoped system writes stop warning. Lose: the signal that would flag a genuine user-path scoping bug | `objectql/src/engine.ts:3929`, `:3939`, `:3966` |
 | 24 | Engine-owned / append-only write guard bypassed | plugin-security | Get: generic writes to `managedBy` engine-owned objects | `system-write-guard.ts:96`, `:120` |
 | 25 | Identity write guard bypassed (ADR-0092) | plugin-auth | Get: direct writes to identity tables through the generic data path | `identity-write-guard.ts:99` |
-| 26 | Search-companion column **kept** in a read's rows when it was explicitly requested | objectql | Get: the internal companion column is readable. Lose: nothing for app code — this is the engine reading its own index | `objectql/src/engine.ts:6893` |
-| 27 | Dependent-count disclosure on a blocked delete | objectql | Get: the count of blocking children. Nothing was elevated past the caller, so nothing is withheld | `objectql/src/engine.ts:12490` |
-| 28 | Reference-cleanup log attributes the write to `'system'` | objectql | Get: an honest actor label instead of `anonymous` when the context carries neither `userId` nor `actor` | `objectql/src/engine.ts:12419` |
+| 26 | Search-companion column **kept** in a read's rows when it was explicitly requested | objectql | Get: the internal companion column is readable. Lose: nothing for app code — this is the engine reading its own index | `objectql/src/engine.ts:6951` |
+| 27 | Dependent-count disclosure on a blocked delete | objectql | Get: the count of blocking children. Nothing was elevated past the caller, so nothing is withheld | `objectql/src/engine.ts:12548` |
+| 28 | Reference-cleanup log attributes the write to `'system'` | objectql | Get: an honest actor label instead of `anonymous` when the context carries neither `userId` nor `actor` | `objectql/src/engine.ts:12477` |
 | 29 | **Bulk data event `organizationId` OMITTED** — the batch is published "not asserted" | plugin-security | Get: nothing — the `data.records.*` event still publishes. Lose: the per-organization attribution: this exit is taken before the security middleware composes any tenant wall, so it records no Layer 0 verdict on the operation (`OperationContext.tenantLayer0Verdict`, #15813), and the engine's bulk producer — which reads that recorded verdict and nothing else — omits the key rather than filling it from the caller's `tenantId`; a tenant-scoped consumer then does not deliver the event inside an organization wall (#15225) | `security-plugin.ts:1686` |
 
 ### 3. Sharing (`plugin-sharing`)
@@ -179,8 +179,8 @@ a reader tracing where elevation travels needs them.
 
 | # | Site | Package | What it does |
 |:--|:---|:---|:---|
-| 62 | `objectql/src/engine.ts:3729` | objectql | Propagates `isSystem` into the hook session so hooks can tell engine self-writes from user writes |
-| 63 | `objectql/src/engine.ts:14937` | objectql | `ScopedContext.isSystem` getter — re-exposes the underlying execution context's flag |
+| 62 | `objectql/src/engine.ts:3736` | objectql | Propagates `isSystem` into the hook session so hooks can tell engine self-writes from user writes |
+| 63 | `objectql/src/engine.ts:14995` | objectql | `ScopedContext.isSystem` getter — re-exposes the underlying execution context's flag |
 | 64 | `plugin-reports/src/report-service.ts:556` | plugin-reports | Threads the flag into the engine call that runs a report |
 | 65 | `body-runner.ts:279` | runtime | Rebuilds an `ExecutionContext` from a hook session, carrying the flag across |
 
@@ -195,7 +195,7 @@ assuming `isSystem` covers it is a documented source of bugs.
 |:---|:---|:---|
 | "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:2032` (rationale at `:1942`–`1944`, #3760), `flow.zod.ts:743` |
 | "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:10319`–`10336` |
+| "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:10377`–`10394` |
 | "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:1590` (#3493 / #6640) |
 | "It stamps `created_by`" | **No.** Audit stamping reads `userId` from the context. A user-less system write stamps nothing — that is today's behaviour, not an error | `runtime-identity.ts:280`–`281` |
 | "It bypasses every guard" | **No.** The last-admin guard applies to **every** context, `isSystem` included — the deprovision path that actually locks an org out is the system one | `last-admin-guard.ts:299` |