cmd/tailscaled,feature/conn25,feature/featuretags: add conn25 to featuretags

Package feature/conn25 is excludeable from a build via the featuretag.
Test it is excluded for minimal builds.

Updates #12614

Signed-off-by: Fran Bull <fran@tailscale.com>

cmd/tailscaled/depaware-min.txt

@@ -35,7 +35,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
      💣 go4.org/mem                                                  from tailscale.com/control/controlbase+
         go4.org/netipx                                               from tailscale.com/ipn/ipnlocal+
         tailscale.com                                                from tailscale.com/version
-        tailscale.com/appc                                           from tailscale.com/ipn/ipnlocal+
+        tailscale.com/appc                                           from tailscale.com/ipn/ipnlocal
         tailscale.com/atomicfile                                     from tailscale.com/ipn+
         tailscale.com/client/tailscale/apitype                       from tailscale.com/ipn/ipnauth+
         tailscale.com/cmd/tailscaled/childproc                       from tailscale.com/cmd/tailscaled
@@ -58,14 +58,13 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         tailscale.com/feature/condregister                           from tailscale.com/cmd/tailscaled
         tailscale.com/feature/condregister/portmapper                from tailscale.com/feature/condregister
         tailscale.com/feature/condregister/useproxy                  from tailscale.com/feature/condregister
-        tailscale.com/feature/conn25                                 from tailscale.com/feature/condregister
         tailscale.com/health                                         from tailscale.com/control/controlclient+
         tailscale.com/health/healthmsg                               from tailscale.com/ipn/ipnlocal+
         tailscale.com/hostinfo                                       from tailscale.com/cmd/tailscaled+
         tailscale.com/ipn                                            from tailscale.com/cmd/tailscaled+
         tailscale.com/ipn/conffile                                   from tailscale.com/cmd/tailscaled+
         tailscale.com/ipn/ipnauth                                    from tailscale.com/ipn/ipnext+
-        tailscale.com/ipn/ipnext                                     from tailscale.com/ipn/ipnlocal+
+        tailscale.com/ipn/ipnext                                     from tailscale.com/ipn/ipnlocal
         tailscale.com/ipn/ipnlocal                                   from tailscale.com/cmd/tailscaled+
         tailscale.com/ipn/ipnserver                                  from tailscale.com/cmd/tailscaled
         tailscale.com/ipn/ipnstate                                   from tailscale.com/control/controlclient+

cmd/tailscaled/depaware-minbox.txt

@@ -42,7 +42,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
      💣 go4.org/mem                                                  from tailscale.com/control/controlbase+
         go4.org/netipx                                               from tailscale.com/ipn/ipnlocal+
         tailscale.com                                                from tailscale.com/version
-        tailscale.com/appc                                           from tailscale.com/ipn/ipnlocal+
+        tailscale.com/appc                                           from tailscale.com/ipn/ipnlocal
         tailscale.com/atomicfile                                     from tailscale.com/ipn+
         tailscale.com/client/local                                   from tailscale.com/client/tailscale+
         tailscale.com/client/tailscale                               from tailscale.com/internal/client/tailscale
@@ -73,7 +73,6 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         tailscale.com/feature/condregister/oauthkey                  from tailscale.com/cmd/tailscale/cli
         tailscale.com/feature/condregister/portmapper                from tailscale.com/feature/condregister+
         tailscale.com/feature/condregister/useproxy                  from tailscale.com/cmd/tailscale/cli+
-        tailscale.com/feature/conn25                                 from tailscale.com/feature/condregister
         tailscale.com/health                                         from tailscale.com/control/controlclient+
         tailscale.com/health/healthmsg                               from tailscale.com/ipn/ipnlocal+
         tailscale.com/hostinfo                                       from tailscale.com/cmd/tailscaled+
@@ -81,7 +80,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         tailscale.com/ipn                                            from tailscale.com/cmd/tailscaled+
         tailscale.com/ipn/conffile                                   from tailscale.com/cmd/tailscaled+
         tailscale.com/ipn/ipnauth                                    from tailscale.com/ipn/ipnext+
-        tailscale.com/ipn/ipnext                                     from tailscale.com/ipn/ipnlocal+
+        tailscale.com/ipn/ipnext                                     from tailscale.com/ipn/ipnlocal
         tailscale.com/ipn/ipnlocal                                   from tailscale.com/cmd/tailscaled+
         tailscale.com/ipn/ipnserver                                  from tailscale.com/cmd/tailscaled
         tailscale.com/ipn/ipnstate                                   from tailscale.com/control/controlclient+

cmd/tailscaled/deps_test.go

@@ -293,6 +293,7 @@ func TestMinTailscaledWithCLI(t *testing.T) {
 			"github.com/hdevalence/ed25519consensus": "unexpected ed25519consensus dep",
 			"tailscale.com/clientupdate/distsign":    "unexpected distsign dep",
 			"archive/tar":                            "unexpected archive/tar dep",
+			"tailscale.com/feature/conn25":           "unexpected conn25 dep",
 		},
 	}.Check(t)
 }

feature/buildfeatures/feature_conn25_disabled.go

@@ -0,0 +1,13 @@
+// Copyright (c) Tailscale Inc & contributors
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Code generated by gen.go; DO NOT EDIT.
+
+//go:build ts_omit_conn25
+
+package buildfeatures
+
+// HasConn25 is whether the binary was built with support for modular feature "Route traffic for configured domains through connector devices".
+// Specifically, it's whether the binary was NOT built with the "ts_omit_conn25" build tag.
+// It's a const so it can be used for dead code elimination.
+const HasConn25 = false

feature/buildfeatures/feature_conn25_enabled.go

@@ -0,0 +1,13 @@
+// Copyright (c) Tailscale Inc & contributors
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Code generated by gen.go; DO NOT EDIT.
+
+//go:build !ts_omit_conn25
+
+package buildfeatures
+
+// HasConn25 is whether the binary was built with support for modular feature "Route traffic for configured domains through connector devices".
+// Specifically, it's whether the binary was NOT built with the "ts_omit_conn25" build tag.
+// It's a const so it can be used for dead code elimination.
+const HasConn25 = true

feature/conn25/conn25.go

@@ -2,6 +2,9 @@
 // SPDX-License-Identifier: BSD-3-Clause
 
 // Package conn25 registers the conn25 feature and implements its associated ipnext.Extension.
+// conn25 will be an app connector like feature that routes traffic for configured domains via
+// connector devices and avoids the "too many routes" pitfall of app connector. It is currently
+// (2026-02-04) some peer API routes for clients to tell connectors about their desired routing.
 package conn25
 
 import (

feature/featuretags/featuretags.go

@@ -138,6 +138,7 @@ var Features = map[FeatureTag]FeatureMeta{
 		Deps: []FeatureTag{"c2n"},
 	},
 	"completion": {Sym: "Completion", Desc: "CLI shell completion"},
+	"conn25":     {Sym: "Conn25", Desc: "Route traffic for configured domains through connector devices"},
 	"cloud":      {Sym: "Cloud", Desc: "detect cloud environment to learn instances IPs and DNS servers"},
 	"dbus": {
 		Sym:                  "DBus",