docs(closeout): reviewer's two residual-record asks — alarms-hub redaction gap named, ConstraintText artifact recorded; all 12 tasks complete

docs/GatewayConfiguration.md

@@ -192,7 +192,7 @@ events (a "gap") and must re-snapshot; whatever is still retained is replayed.
 | `MxGateway:Dashboard:SnapshotIntervalMilliseconds` | `1000` | Dashboard snapshot refresh interval used by the snapshot SignalR hub and the pages that subscribe to it. |
 | `MxGateway:Dashboard:RecentFaultLimit` | `100` | Maximum number of fault summaries projected into each dashboard snapshot. |
 | `MxGateway:Dashboard:RecentSessionLimit` | `200` | Maximum number of session summaries projected into each dashboard snapshot. |
-| `MxGateway:Dashboard:ShowTagValues` | `false` | Controls whether tag values reach the dashboard's SignalR events hub mirror. `false` (default): `DashboardEventBroadcaster` blanks tag values from a deep-cloned copy of each `MxEvent` before it reaches any hub subscriber — event metadata (tag reference, quality, status, timestamps) still renders; see `docs/GatewayDashboardDesign.md`'s `EventsHub` row for the mechanism. This is now the second of two independent layers, not the only one: `IDashboardSessionAcl` decides *which* sessions a caller may subscribe to at all (see `GroupToTag` / `UntaggedSessionVisibility` below), while this flag decides what a permitted subscriber sees. Setting it `true` therefore exposes tag values to everyone the ACL admits — every Administrator, plus each Viewer holding a matching tag. The flag gates only the SignalR hub mirror — it does **not** cover the `/browse` live-value display, which remains a separate, still-open residual. |
+| `MxGateway:Dashboard:ShowTagValues` | `false` | Controls whether tag values reach the dashboard's SignalR events hub mirror. `false` (default): `DashboardEventBroadcaster` blanks tag values from a deep-cloned copy of each `MxEvent` before it reaches any hub subscriber — event metadata (tag reference, quality, status, timestamps) still renders; see `docs/GatewayDashboardDesign.md`'s `EventsHub` row for the mechanism. This is now the second of two independent layers, not the only one: `IDashboardSessionAcl` decides *which* sessions a caller may subscribe to at all (see `GroupToTag` / `UntaggedSessionVisibility` below), while this flag decides what a permitted subscriber sees. Setting it `true` therefore exposes tag values to everyone the ACL admits — every Administrator, plus each Viewer holding a matching tag. The flag gates only the SignalR events hub mirror — it does **not** cover the `/browse` live-value display, nor the alarms hub (`AlarmsHubPublisher` broadcasts alarm transitions with their `current_value`/`limit_value` fields unredacted); both remain separate, still-open residuals. |
 | `MxGateway:Dashboard:GroupToRole` | _(empty)_ | LDAP group → dashboard role mapping. Keys are LDAP group names (short CN or full DN — leading-RDN match). Values must be `Administrator` (read/write, API-key CRUD) or `Viewer` (read-only) — matched ordinally by the startup validator, so the spelling is exact and `Admin` is rejected. A user whose LDAP groups don't intersect this map cannot sign in; with no mapping at all, only the loopback bypass admits anyone. |
 | `MxGateway:Dashboard:GroupToTag` | _(empty)_ | LDAP group → dashboard visibility tags. Keys follow the same convention as `GroupToRole` (short CN or full DN — leading-RDN match, case-insensitive); values are tag lists. A dashboard user's granted tag set is the union over the groups they belong to; an unmapped group contributes nothing. **Visibility only:** tags scope which sessions' event streams a Viewer may observe on the dashboard — they never grant or deny data access, which stays with the API key's scopes and constraints. Independent of `GroupToRole`: a group may appear in either map, both, or neither. Empty (the default) means Viewers hold no tags, so under the default `UntaggedSessionVisibility` they observe no session's events. |
 | `MxGateway:Dashboard:UntaggedSessionVisibility` | `AdminOnly` | Who may observe a session that carries no tags (its owning API key declared none). `AdminOnly` (default, fail-closed) restricts untagged sessions to dashboard Administrators. `AllViewers` shows them to every Viewer — opt-in for a single-tenant deployment that wants the pre-tag behaviour. Administrators always see every session regardless of tags. |