feat(api): code-first OpenAPI generation + typed frontend client

#47 shipped the projects routes (mock manager/store) that the #24 route-shell
PR was building, leaving #24 conflicting on nearly every file. The route shell
itself is now redundant, but two pieces of #24 are genuinely net-new and absent
from main — salvage them here, rebuilt on top of #47's merged code:

- Code-first OpenAPI: apispec/specgen reflects the controllers' request/response
  types and project DTOs (the same types the handlers use at runtime) into
  openapi.yaml via swaggest. `cmd/genspec` + `go:generate` regenerate the
  committed, embedded spec; a drift test (TestBuild_MatchesEmbedded) and a route
  parity test (TestRouteSpecParity) fail CI if the spec and the code disagree.
  This replaces main's hand-maintained openapi.yaml so the "single source of
  truth" claim is actually enforced, not aspirational.

- Typed frontend client: frontend/src/api/schema.d.ts is generated from that
  spec via openapi-typescript (`npm run gen:api`), consumed by a small
  openapi-fetch client. The frontend now gets its types from the daemon
  contract instead of hand-maintaining them.

specgen lives outside apispec (which controllers import for the 501 stub) to
avoid an import cycle. Handlers now encode named response DTOs
(controllers/dto.go) instead of map[string]any so the generator reflects the
real wire shapes. A gen-verify CI job regenerates both artifacts and fails on a
stale commit.

Tradeoff: the generated spec drops the hand-authored examples / x-rest-audit
notes from #47's openapi.yaml; those can be re-added as operation metadata in
specgen if wanted. Behaviour-only patch (no handler logic changes).

Supersedes the codegen + frontend parts of #24. Refs #20, #47.

Author: i-trytoohard

.github/workflows/go.yml

@@ -6,6 +6,7 @@ on:
   pull_request:
     paths:
       - "backend/**"
+      - "frontend/**"
       - ".github/workflows/go.yml"
 
 permissions:
@@ -42,3 +43,40 @@ jobs:
 
       - name: Test
         run: go test -race ./...
+
+  # gen-verify regenerates the code-first artifacts (openapi.yaml from Go, then
+  # the frontend TS types from that spec) and fails if the committed copies are
+  # stale — i.e. someone changed a Go contract type without running
+  # `go generate ./...` + `npm run gen:api`.
+  gen-verify:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.22"
+          cache: false
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+          cache: npm
+          cache-dependency-path: frontend/package-lock.json
+
+      - name: Generate OpenAPI from Go
+        working-directory: backend
+        run: go generate ./...
+
+      - name: Generate TypeScript from OpenAPI
+        working-directory: frontend
+        run: |
+          npm ci
+          npm run gen:api
+
+      - name: Fail on stale generated files
+        run: |
+          if ! git diff --exit-code; then
+            echo "::error::Generated files are stale. Run 'go generate ./...' in backend and 'npm run gen:api' in frontend, then commit."
+            exit 1
+          fi

backend/cmd/genspec/main.go

@@ -0,0 +1,26 @@
+// Command genspec writes the code-first OpenAPI document produced by
+// apispec.Build() to disk. It is invoked via `go generate` (see
+// internal/httpd/apispec/gen.go); the output openapi.yaml is committed and
+// embedded by the apispec package.
+package main
+
+import (
+	"flag"
+	"log"
+	"os"
+
+	"github.com/aoagents/agent-orchestrator/backend/internal/httpd/apispec/specgen"
+)
+
+func main() {
+	out := flag.String("out", "openapi.yaml", "output path for the generated OpenAPI document")
+	flag.Parse()
+
+	doc, err := specgen.Build()
+	if err != nil {
+		log.Fatalf("genspec: build openapi: %v", err)
+	}
+	if err := os.WriteFile(*out, doc, 0o644); err != nil {
+		log.Fatalf("genspec: write %s: %v", *out, err)
+	}
+}

backend/go.mod

@@ -7,6 +7,8 @@ require (
 	github.com/creack/pty v1.1.24
 	github.com/go-chi/chi/v5 v5.1.0
 	github.com/pressly/goose/v3 v3.27.1
+	github.com/swaggest/jsonschema-go v0.3.79
+	github.com/swaggest/openapi-go v0.2.61
 	gopkg.in/yaml.v3 v3.0.1
 	modernc.org/sqlite v1.51.0
 )
@@ -19,9 +21,11 @@ require (
 	github.com/ncruces/go-strftime v1.0.0 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
 	github.com/sethvargo/go-retry v0.3.0 // indirect
+	github.com/swaggest/refl v1.4.0 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
 	golang.org/x/sync v0.20.0 // indirect
 	golang.org/x/sys v0.43.0 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
 	modernc.org/libc v1.72.3 // indirect
 	modernc.org/mathutil v1.7.1 // indirect
 	modernc.org/memory v1.11.0 // indirect

backend/go.sum

@@ -1,3 +1,7 @@
+github.com/bool64/dev v0.2.43 h1:yQ7qiZVef6WtCl2vDYU0Y+qSq+0aBrQzY8KXkklk9cQ=
+github.com/bool64/dev v0.2.43/go.mod h1:iJbh1y/HkunEPhgebWRNcs8wfGq7sjvJ6W5iabL8ACg=
+github.com/bool64/shared v0.1.5 h1:fp3eUhBsrSjNCQPcSdQqZxxh9bBwrYiZ+zOKFkM0/2E=
+github.com/bool64/shared v0.1.5/go.mod h1:081yz68YC9jeFB3+Bbmno2RFWvGKv1lPKkMP6MHJlPs=
 github.com/coder/websocket v1.8.14 h1:9L0p0iKiNOibykf283eHkKUHHrpG7f65OE3BhhO7v9g=
 github.com/coder/websocket v1.8.14/go.mod h1:NX3SzP+inril6yawo5CQXx8+fk145lPDC6pumgx0mVg=
 github.com/creack/pty v1.1.24 h1:bJrF4RRfyJnbTJqzRLHzcGaZK1NeM5kTC9jGgovnR1s=
@@ -14,6 +18,8 @@ github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/hashicorp/golang-lru/v2 v2.0.7 h1:a+bsQ5rvGLjzHuww6tVxozPZFVghXaHOwFs4luLUK2k=
 github.com/hashicorp/golang-lru/v2 v2.0.7/go.mod h1:QeFd9opnmA6QUJc5vARoKUSoFhyfM2/ZepoAG6RGpeM=
+github.com/iancoleman/orderedmap v0.3.0 h1:5cbR2grmZR/DiVt+VJopEhtVs9YGInGIxAoMJn+Ichc=
+github.com/iancoleman/orderedmap v0.3.0/go.mod h1:XuLcCUkdL5owUCQeF2Ue9uuw1EptkJDkXXS7VoV7XGE=
 github.com/mattn/go-isatty v0.0.21 h1:xYae+lCNBP7QuW4PUnNG61ffM4hVIfm+zUzDuSzYLGs=
 github.com/mattn/go-isatty v0.0.21/go.mod h1:ZXfXG4SQHsB/w3ZeOYbR0PrPwLy+n6xiMrJlRFqopa4=
 github.com/mfridman/interpolate v0.0.2 h1:pnuTK7MQIxxFz1Gr+rjSIx9u7qVjf5VOoM/u6BbAxPY=
@@ -26,10 +32,24 @@ github.com/pressly/goose/v3 v3.27.1 h1:6uEvcprBybDmW4hcz3gYujhARhye+GoWKhEWyzD5s
 github.com/pressly/goose/v3 v3.27.1/go.mod h1:maruOxsPnIG2yHHyo8UqKWXYKFcH7Q76csUV7+7KYoM=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec h1:W09IVJc94icq4NjY3clb7Lk8O1qJ8BdBEF8z0ibU0rE=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
+github.com/sergi/go-diff v1.3.1 h1:xkr+Oxo4BOQKmkn/B9eMK0g5Kg/983T9DqqPHwYqD+8=
+github.com/sergi/go-diff v1.3.1/go.mod h1:aMJSSKb2lpPvRNec0+w3fl7LP9IOFzdc9Pa4NFbPK1I=
 github.com/sethvargo/go-retry v0.3.0 h1:EEt31A35QhrcRZtrYFDTBg91cqZVnFL2navjDrah2SE=
 github.com/sethvargo/go-retry v0.3.0/go.mod h1:mNX17F0C/HguQMyMyJxcnU471gOZGxCLyYaFyAZraas=
 github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
 github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
+github.com/swaggest/assertjson v1.9.0 h1:dKu0BfJkIxv/xe//mkCrK5yZbs79jL7OVf9Ija7o2xQ=
+github.com/swaggest/assertjson v1.9.0/go.mod h1:b+ZKX2VRiUjxfUIal0HDN85W0nHPAYUbYH5WkkSsFsU=
+github.com/swaggest/jsonschema-go v0.3.79 h1:0TOShCbAJ9Xjt1e2W83l+QtMQSG2pbun2EkiYTyafCs=
+github.com/swaggest/jsonschema-go v0.3.79/go.mod h1:GqVmJ+XNLeUHhFIhHNKc+C68euxfrl3a3aoZH4vTRl0=
+github.com/swaggest/openapi-go v0.2.61 h1:psc+LE7pWhEjmJpmkti9tUmBPkkobdUNflBf5Ps6JSc=
+github.com/swaggest/openapi-go v0.2.61/go.mod h1:786CwSwleh1IorB0nfwYGESWf83JgQh6fBc1PeJe4Iw=
+github.com/swaggest/refl v1.4.0 h1:CftOSdTqRqs100xpFOT/Rifss5xBV/CT0S/FN60Xe9k=
+github.com/swaggest/refl v1.4.0/go.mod h1:4uUVFVfPJ0NSX9FPwMPspeHos9wPFlCMGoPRllUbpvA=
+github.com/yudai/gojsondiff v1.0.0 h1:27cbfqXLVEJ1o8I6v3y9lg8Ydm53EKqHXAOMxEGlCOA=
+github.com/yudai/gojsondiff v1.0.0/go.mod h1:AY32+k2cwILAkW1fbgxQ5mUmMiZFgLIV+FBNExI05xg=
+github.com/yudai/golcs v0.0.0-20170316035057-ecda9a501e82 h1:BHyfKlQyqbsFN5p3IfnEUduWvb9is428/nNb5L3U01M=
+github.com/yudai/golcs v0.0.0-20170316035057-ecda9a501e82/go.mod h1:lgjkn3NuSvDfVJdfcVVdX+jpBxNmX4rDAzaS45IcYoM=
 go.uber.org/multierr v1.11.0 h1:blXXJkSxSSfBVBlC76pxqeO+LN3aDfLQo+309xJstO0=
 go.uber.org/multierr v1.11.0/go.mod h1:20+QtiLqy0Nd6FdQB9TLXag12DsQkrbs3htMFfDN80Y=
 golang.org/x/mod v0.33.0 h1:tHFzIWbBifEmbwtGz65eaWyGiGZatSrT9prnU8DbVL8=
@@ -42,6 +62,8 @@ golang.org/x/tools v0.42.0 h1:uNgphsn75Tdz5Ji2q36v/nsFSfR/9BRFvqhGBaJGd5k=
 golang.org/x/tools v0.42.0/go.mod h1:Ma6lCIwGZvHK6XtgbswSoWroEkhugApmsXyrUmBhfr0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 modernc.org/cc/v4 v4.28.2 h1:3tQ0lf2ADtoby2EtSP+J7IE2SHwEJdP8ioR59wx7XpY=

backend/internal/httpd/apispec/gen.go

@@ -0,0 +1,6 @@
+package apispec
+
+// openapi.yaml is generated from Go (see build.go) — do not edit it by hand.
+// Regenerate with `go generate ./...` from the backend module root.
+//
+//go:generate go run ../../../cmd/genspec -out openapi.yaml