docs(permissions): re-anchor the system-context census line citations after the rest-server insertions

Pure line rot, produced by `node scripts/check-system-context-census.mjs --fix`:
this card's additions to `rest-server.ts` shifted the cited lines by +24 before
the posture block and +79 after it. No prose and no row semantics change — only
the line numbers the page cites.

check-system-context-census: OK — 106 elevation read sites in 20 packages across
45 files, all anchored; 140 anchors resolve, 27 declared non-read.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: hotlong

content/docs/permissions/system-context.mdx

@@ -64,7 +64,7 @@ not on any flag.
 ## How the flag is set
 
 `isSystem` is **server-constructed and never client-supplied**. Inbound HTTP
-cannot set it (`packages/rest/src/rest-server.ts:1524`, `:1553`), and neither
+cannot set it (`packages/rest/src/rest-server.ts:1548`, `:1577`), and neither
 can an action body (`packages/runtime/src/domains/actions.ts:404`). It is
 written by internal callers only, as an option on the engine call:
 
@@ -103,7 +103,7 @@ that silently does not happen.
 | 14 | MCP stdio bridge skips the object API-exposure gate | mcp | Get: the bridge reaches objects whose `apiEnabled` / `apiMethods` would refuse an external caller | `stdio-data-bridge.ts:246` |
 | 15 | **Read-audit rows are not written** | plugin-audit | Lose: the "a person opened this record" trail. `sudo()` keeps the caller's `userId`, so this flag is the only thing separating a human read from a platform one | `read-audit.ts:556` |
 | 16 | Approval snapshot payload redaction skipped | plugin-approvals | Get: the whole snapshot on `find` / `findOne` — the audit/replay channel. Lose: field-visibility redaction over approval payloads | `payload-redaction-middleware.ts:115` |
-| 17 | REST anonymous-deny seam satisfied | rest | Get: `enforceAuth` passes with no `userId`. Not reachable from the wire — `isSystem` is never set on an inbound request | `rest-server.ts:1556` |
+| 17 | REST anonymous-deny seam satisfied | rest | Get: `enforceAuth` passes with no `userId`. Not reachable from the wire — `isSystem` is never set on an inbound request | `rest-server.ts:1580` |
 
 ### 2. Write pipeline and data integrity
 
@@ -158,7 +158,7 @@ The largest single consumer — **17 of the 106 sites**.
 |:--|:---|:---|:---|:---|
 | 48 | Object API-exposure gate bypassed (`apiEnabled` / `apiMethods`) | runtime | Get: internal self-writes ignore exposure declarations — these govern **external** exposure, not engine self-writes | `action-execution.ts:138` |
 | 49 | Action `requiredPermissions` bypassed | runtime | Get: engine self-invocation runs any action | `action-execution.ts:401` |
-| 50 | `manage_metadata` bypassed on metadata writes | runtime, rest | Get: schema writes without the capability | `domains/meta.ts:471`, `:874`, `rest-server.ts:4888`, `:6302`, `:6550`, `:6981`, `:7174` |
+| 50 | `manage_metadata` bypassed on metadata writes | runtime, rest | Get: schema writes without the capability | `domains/meta.ts:471`, `:874`, `rest-server.ts:4967`, `:6381`, `:6629`, `:7060`, `:7253` |
 | 51 | The shared metadata-write verdict itself returns `allowed` | metadata-core | Get: the one function all of row 50's doors consult answers yes before any capability is examined | `meta-write-capability.ts:134` |
 | 52 | Anonymous-deny seam satisfied on the domain dispatchers and the package/federation routes | runtime, rest | Get: passes with no `userId` | `domains/actions.ts:411`, `domains/ai.ts:60`, `domains/automation.ts:989`, `domains/meta.ts:232`, `domains/security.ts:78`, `domains/packages.ts:422`, `external-datasource-routes.ts:302`, `package-routes.ts:97` |
 | 53 | MCP principal check satisfied | runtime | Get: MCP surface reachable with no user | `domains/mcp.ts:61` |
@@ -199,7 +199,7 @@ assuming `isSystem` covers it is a documented source of bugs.
 | "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:1580` (#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` |
-| "A client can request it" | **No.** Never settable from inbound HTTP or from an action body | `rest-server.ts:1524`, `:1553`; `domains/actions.ts:404` |
+| "A client can request it" | **No.** Never settable from inbound HTTP or from an action body | `rest-server.ts:1548`, `:1577`; `domains/actions.ts:404` |
 
 ---