v0 plan: AGENTS.md, gate, five task files with given tests, run-plan driver

Tests were run against a private reference implementation: gate ok after every
task in order, smoke ok (stream spread ~1000 ms). The reference is not in the
repository.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

docs/plans/v0/files/internal/config/config_test.go

@@ -0,0 +1,191 @@
+package config_test
+
+import (
+	"fmt"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+
+	"git.wntrmute.dev/kyle/crossbar/internal/config"
+)
+
+func TestGoodFile(t *testing.T) {
+	c, err := config.Load(filepath.Join("testdata", "good.toml"))
+	if err != nil {
+		t.Fatalf("Load: %v", err)
+	}
+	if c.Listen != "100.64.0.9:7777" {
+		t.Errorf("Listen = %q", c.Listen)
+	}
+	if c.PollInterval.Duration != 5*time.Second {
+		t.Errorf("PollInterval = %v", c.PollInterval.Duration)
+	}
+	if c.QueueMax != 4 {
+		t.Errorf("QueueMax = %d", c.QueueMax)
+	}
+	alpha := c.Hosts["alpha"]
+	if alpha.BaseURL != "http://alpha.example:11434" {
+		t.Errorf("trailing slash not stripped: %q", alpha.BaseURL)
+	}
+	if alpha.Weight != 2 {
+		t.Errorf("alpha.Weight = %v", alpha.Weight)
+	}
+	if alpha.Models["ornith-1.5-35b-a3b"].Parallel != 4 || alpha.Models["small-9b"].Parallel != 6 {
+		t.Errorf("alpha.Models = %+v", alpha.Models)
+	}
+	beta := c.Hosts["beta"]
+	if beta.Weight != 1 {
+		t.Errorf("beta.Weight default = %v, want 1", beta.Weight)
+	}
+	if beta.Models["ornith-1.5-35b-a3b"].Parallel != 1 {
+		t.Errorf("beta parallel default = %d, want 1", beta.Models["ornith-1.5-35b-a3b"].Parallel)
+	}
+	r := c.Routes["opencode-a"]
+	if len(r.Hosts) != 2 || r.Hosts[0] != "alpha" || r.Hosts[1] != "beta" {
+		t.Errorf("route hosts = %v", r.Hosts)
+	}
+	if r.DefaultModel != "ornith-1.5-35b-a3b" {
+		t.Errorf("DefaultModel = %q", r.DefaultModel)
+	}
+	if c.Routes["hermes-x"].DefaultModel != "" {
+		t.Errorf("hermes-x DefaultModel should be empty")
+	}
+	if !c.Serves("alpha", "small-9b") || c.Serves("beta", "small-9b") || c.Serves("nope", "m") {
+		t.Errorf("Serves is wrong")
+	}
+}
+
+func TestDefaults(t *testing.T) {
+	c, err := config.Parse(strings.NewReader(`
+listen = "127.0.0.1:1"
+[hosts.a]
+base_url = "http://a:1"
+models = { "m" = { } }
+[routes.r]
+hosts = ["a"]
+`))
+	if err != nil {
+		t.Fatalf("Parse: %v", err)
+	}
+	if c.PollInterval.Duration != config.DefaultPollInterval {
+		t.Errorf("PollInterval default = %v", c.PollInterval.Duration)
+	}
+	if c.QueueMax != config.DefaultQueueMax {
+		t.Errorf("QueueMax default = %d", c.QueueMax)
+	}
+}
+
+func TestBadFiles(t *testing.T) {
+	cases := []struct{ file, field string }{
+		{"bad-listen.toml", "listen"},
+		{"bad-unknown-host.toml", "routes.r.hosts"},
+		{"bad-default-model.toml", "routes.r.default_model"},
+		{"bad-unknown-key.toml", "lease_idle"},
+	}
+	for _, tc := range cases {
+		t.Run(tc.file, func(t *testing.T) {
+			_, err := config.Load(filepath.Join("testdata", tc.file))
+			if err == nil {
+				t.Fatalf("want error")
+			}
+			e, ok := config.IsError(err)
+			if !ok {
+				t.Fatalf("want *config.Error, got %T: %v", err, err)
+			}
+			if e.Field != tc.field {
+				t.Errorf("Field = %q, want %q (%v)", e.Field, tc.field, err)
+			}
+			if !strings.HasPrefix(err.Error(), "config: "+tc.field+": ") {
+				t.Errorf("Error() = %q", err.Error())
+			}
+		})
+	}
+}
+
+func TestBadValues(t *testing.T) {
+	base := `
+listen = %q
+poll_interval = %q
+[hosts.a]
+base_url = %q
+weight = %v
+models = { "m" = { parallel = %d } }
+[routes.%s]
+hosts = ["a"]
+`
+	cases := []struct {
+		name                     string
+		listen, poll, url, route string
+		weight                   float64
+		parallel                 int
+		field                    string
+	}{
+		{"empty listen", "", "5s", "http://a:1", "r", 1, 1, "listen"},
+		{"no port", "127.0.0.1", "5s", "http://a:1", "r", 1, 1, "listen"},
+		{"v6 any", "[::]:7", "5s", "http://a:1", "r", 1, 1, "listen"},
+		{"poll too short", "127.0.0.1:7", "500ms", "http://a:1", "r", 1, 1, "poll_interval"},
+		{"ftp url", "127.0.0.1:7", "5s", "ftp://a:1", "r", 1, 1, "hosts.a.base_url"},
+		{"no host", "127.0.0.1:7", "5s", "http://", "r", 1, 1, "hosts.a.base_url"},
+		{"query", "127.0.0.1:7", "5s", "http://a:1/v1?x=1", "r", 1, 1, "hosts.a.base_url"},
+		{"negative weight", "127.0.0.1:7", "5s", "http://a:1", "r", -1, 1, "hosts.a.weight"},
+		{"negative parallel", "127.0.0.1:7", "5s", "http://a:1", "r", 1, -2, "hosts.a.models.m.parallel"},
+		{"route name", "127.0.0.1:7", "5s", "http://a:1", "Bad_Name", 1, 1, "routes.Bad_Name"},
+	}
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			text := fmt.Sprintf(base, tc.listen, tc.poll, tc.url, tc.weight, tc.parallel, tc.route)
+			_, err := config.Parse(strings.NewReader(text))
+			if err == nil {
+				t.Fatalf("want error for %s", tc.name)
+			}
+			e, ok := config.IsError(err)
+			if !ok {
+				t.Fatalf("want *config.Error, got %T: %v", err, err)
+			}
+			if e.Field != tc.field {
+				t.Errorf("Field = %q, want %q (%v)", e.Field, tc.field, err)
+			}
+		})
+	}
+}
+
+func TestMissingSections(t *testing.T) {
+	for _, tc := range []struct{ name, text, field string }{
+		{"no hosts", "listen = \"127.0.0.1:7\"\n[routes.r]\nhosts = [\"a\"]\n", "hosts"},
+		{"no routes", "listen = \"127.0.0.1:7\"\n[hosts.a]\nbase_url = \"http://a:1\"\nmodels = { \"m\" = { } }\n", "routes"},
+		{"host without models", "listen = \"127.0.0.1:7\"\n[hosts.a]\nbase_url = \"http://a:1\"\n[routes.r]\nhosts = [\"a\"]\n", "hosts.a.models"},
+		{"route without hosts", "listen = \"127.0.0.1:7\"\n[hosts.a]\nbase_url = \"http://a:1\"\nmodels = { \"m\" = { } }\n[routes.r]\n", "routes.r.hosts"},
+		{"host twice", "listen = \"127.0.0.1:7\"\n[hosts.a]\nbase_url = \"http://a:1\"\nmodels = { \"m\" = { } }\n[routes.r]\nhosts = [\"a\", \"a\"]\n", "routes.r.hosts"},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			_, err := config.Parse(strings.NewReader(tc.text))
+			e, ok := config.IsError(err)
+			if !ok {
+				t.Fatalf("want *config.Error, got %v", err)
+			}
+			if e.Field != tc.field {
+				t.Errorf("Field = %q, want %q", e.Field, tc.field)
+			}
+		})
+	}
+}
+
+func TestNotTOML(t *testing.T) {
+	_, err := config.Parse(strings.NewReader("listen = [unterminated"))
+	if err == nil {
+		t.Fatal("want error")
+	}
+	if _, ok := config.IsError(err); ok {
+		t.Errorf("a syntax error is not a validation Error")
+	}
+	if !strings.HasPrefix(err.Error(), "config: ") {
+		t.Errorf("Error() = %q", err.Error())
+	}
+}
+
+func TestMissingFile(t *testing.T) {
+	if _, err := config.Load(filepath.Join("testdata", "does-not-exist.toml")); err == nil {
+		t.Fatal("want error")
+	}
+}

docs/plans/v0/files/internal/config/testdata/bad-default-model.toml

@@ -0,0 +1,9 @@
+listen = "127.0.0.1:7777"
+
+[hosts.alpha]
+base_url = "http://alpha.example:11434"
+models   = { "m" = { } }
+
+[routes.r]
+hosts         = ["alpha"]
+default_model = "not-served"

docs/plans/v0/files/internal/config/testdata/bad-listen.toml

@@ -0,0 +1,8 @@
+listen = "0.0.0.0:7777"
+
+[hosts.alpha]
+base_url = "http://alpha.example:11434"
+models   = { "m" = { } }
+
+[routes.r]
+hosts = ["alpha"]

docs/plans/v0/files/internal/config/testdata/bad-unknown-host.toml

@@ -0,0 +1,8 @@
+listen = "127.0.0.1:7777"
+
+[hosts.alpha]
+base_url = "http://alpha.example:11434"
+models   = { "m" = { } }
+
+[routes.r]
+hosts = ["alpha", "gamma"]

docs/plans/v0/files/internal/config/testdata/bad-unknown-key.toml

@@ -0,0 +1,9 @@
+listen = "127.0.0.1:7777"
+lease_idle = "30m"
+
+[hosts.alpha]
+base_url = "http://alpha.example:11434"
+models   = { "m" = { } }
+
+[routes.r]
+hosts = ["alpha"]

docs/plans/v0/files/internal/config/testdata/good.toml

@@ -0,0 +1,19 @@
+listen        = "100.64.0.9:7777"
+poll_interval = "5s"
+queue_max     = 4
+
+[hosts.alpha]
+base_url = "http://alpha.example:11434/"
+weight   = 2.0
+models   = { "ornith-1.5-35b-a3b" = { parallel = 4 }, "small-9b" = { parallel = 6 } }
+
+[hosts.beta]
+base_url = "https://beta.example:8081"
+models   = { "ornith-1.5-35b-a3b" = { } }
+
+[routes.opencode-a]
+hosts         = ["alpha", "beta"]
+default_model = "ornith-1.5-35b-a3b"
+
+[routes.hermes-x]
+hosts = ["beta"]