feat: add core session goals (#87469)

* feat: add core session goals

* feat: polish session goals in tui

* fix: resolve goal tool session stores

* fix: keep get goal read-only

* fix: migrate legacy goal session slots

* fix: persist goal token accounting

* fix: validate goal session rows

* refactor: remove unshipped goal legacy handling

* fix: handle goal commands in local tui

* fix: satisfy goal tool display checks

* fix: reset goal budget on overdue resume

* feat: surface session goals across control surfaces

* test: update gateway protocol test import

* test: align goal fixture types with protocol

* fix: scope selected global transcript usage fallback

* fix: scope selected global web subscriptions

* fix: preserve selected global agent during chat dispatch

* fix: scope chat inject to selected global agents

docs/docs.json

@@ -1333,6 +1333,7 @@
                 "group": "Agent coordination",
                 "pages": [
                   "tools/agent-send",
+                  "tools/goal",
                   "tools/steer",
                   "tools/subagents",
                   "tools/acp-agents",