fix(workplans): declare type: workplan on records the hub already holds

These files carried no type field at all. Selection is by 'type: workplan', so
they were invisible to every projection while the hub held a record for each —
and a forge-derived reset read those correct records as no longer deriving and
queued them for retirement.

Only the type line is added.

Refs STATE-WP-0083-T05

Assistant: claude-code
Assistant-Model: opus
Assistant-Process: 2583210@bnt-lap001
Assistant-Session: f2bff2d5-e9b2-4338-92ca-10282a927006

workplans/GLAS-WP-0001-harness-router-foundation.md

@@ -1,5 +1,6 @@
 ---
 id: GLAS-WP-0001
+type: workplan
 title: "Harness router foundation: contract + first two reins"
 status: finished
 state_hub_workstream_id: "4b8740d9-9ea8-4c11-abfc-af9e9ac1c2df"

workplans/GLAS-WP-0002-observability-and-composability-followups.md

@@ -1,5 +1,6 @@
 ---
 id: GLAS-WP-0002
+type: workplan
 title: "Observability and composability follow-ups"
 status: finished
 state_hub_workstream_id: "ec0777ff-18ce-4666-abaf-5bd2ff0fd4b9"

workplans/GLAS-WP-0003-first-channel-extension.md

@@ -1,5 +1,6 @@
 ---
 id: GLAS-WP-0003
+type: workplan
 title: "First channel extension: formalize the CLI channel contract"
 status: finished
 state_hub_workstream_id: "78da8b34-27dd-4807-b7c8-321328dd2db8"