feat(tools): add SpawnStatusTool for reporting subagent statuses (#1540)

* feat(tools): add SpawnStatusTool for reporting subagent statuses

* feat(tools): enhance SpawnStatusTool to restrict task visibility by conversation context

* feat(tests): add Unicode result truncation and channel filtering tests for SpawnStatusTool

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

* feat(tools): enhance SpawnStatusTool with task ID validation and sorting by creation timestamp

* feat(tools): update SpawnStatusTool description and parameter documentation for clarity

* refactor(tests): improve comments for clarity in ChannelFiltering test case

* fix(tools): update no subagents message for clarity and remove unnecessary locking in runTask

* fix(tools): improve description clarity for SpawnStatusTool regarding task context

* feat(tools): add spawn_status tool configuration and registration

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

* fix(agent): improve subagent management for spawn and spawn_status tools

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

* fix(tests): update ResultTruncation_Unicode test to use valid CJK character

---------

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
Co-authored-by: lxowalle <83055338+lxowalle@users.noreply.github.com>

web/backend/api/tools.go

@@ -118,6 +118,12 @@ var toolCatalog = []toolCatalogEntry{
 		Category:    "agents",
 		ConfigKey:   "spawn",
 	},
+	{
+		Name:        "spawn_status",
+		Description: "Query the status of spawned subagents.",
+		Category:    "agents",
+		ConfigKey:   "spawn_status",
+	},
 	{
 		Name:        "i2c",
 		Description: "Interact with I2C hardware devices exposed on the host.",
@@ -205,7 +211,7 @@ func buildToolSupport(cfg *config.Config) []toolSupportItem {
 					reasonCode = "requires_skills"
 				}
 			}
-		case "spawn":
+		case "spawn", "spawn_status":
 			if cfg.Tools.IsToolEnabled(entry.ConfigKey) {
 				if cfg.Tools.IsToolEnabled("subagent") {
 					status = "enabled"
@@ -300,6 +306,12 @@ func applyToolState(cfg *config.Config, toolName string, enabled bool) error {
 		if enabled {
 			cfg.Tools.Subagent.Enabled = true
 		}
+	case "spawn_status":
+		cfg.Tools.SpawnStatus.Enabled = enabled
+		if enabled {
+			cfg.Tools.Spawn.Enabled = true
+			cfg.Tools.Subagent.Enabled = true
+		}
 	case "i2c":
 		cfg.Tools.I2C.Enabled = enabled
 	case "spi":