feat(oidc): POST /api/v1/auth/oidc/test dry-run endpoint (MED-5)

Audit 2026-05-10 MED-5 closure (backend half).

WHAT.

New POST /api/v1/auth/oidc/test endpoint that validates an OIDC
provider configuration without persisting anything. Mirrors the
read-only legs of the production getOrLoad path so operators can
catch typos / network reachability problems / IdP-advertises-weak-
alg conditions BEFORE creating the provider row.

Request body: {issuer_url, client_id, client_secret, scopes} —
client_secret is accepted but unused (discovery + JWKS reachability
do not require it).

Response body: TestDiscoveryResult{
  discovery_succeeded     — gooidc.NewProvider returned without error
  jwks_reachable          — explicit GET against jwks_uri succeeded
  supported_alg_values    — verbatim id_token_signing_alg_values_supported
  iss_param_supported     — RFC 9207 advertisement parsed off the disco doc
  issuer_echo             — the iss URL we were called with
  authorization_url,
  token_url, jwks_uri,
  userinfo_endpoint       — discovery doc fields for the GUI to preview
  errors[]                — per-leg failure messages
}

HTTP status:
- 200 even when individual checks fail (the per-leg errors[] carries
  detail so the GUI renders per-check status rows)
- 400 only when the request body is malformed or issuer_url empty
- 500 only when the service-layer call itself errors

WHY.

Pre-fix, operators configuring OIDC had to create a provider, then
hit /refresh, then read the audit log to figure out whether the
discovery doc was reachable / whether the IdP advertises HS256
(the alg-downgrade trap). The GUI rendered no per-check feedback.
MED-5 closes the dry-run gap for the same reason every Issuer +
Target connector has a 'Test connection' button — operator
experience parity.

HOW.

internal/auth/oidc/test_discovery.go (NEW):
  - TestDiscoveryResult struct with the per-leg projection.
  - Service.TestDiscovery(ctx, issuerURL) drives the read-only
    subset of getOrLoad: gooidc.NewProvider, claims parse for
    alg-supported + iss-param-supported + jwks_uri + userinfo,
    alg-downgrade defense, jwksReachable HTTP GET.
  - jwksReachable is a package-level closure so tests can swap.

internal/api/handler/auth_session_oidc.go:
  - TestProvider HTTP handler. Uses an inline discoveryTester
    interface to type-assert against the OIDCAuthHandshaker stub
    (the production Service satisfies; test stubs supply via
    explicit method). Audit row 'auth.oidc_provider_tested' carries
    the summary fields.

internal/api/router/router.go:
  - Wired as POST /api/v1/auth/oidc/test under rbacGate('auth.oidc.create').

internal/api/handler/auth_session_oidc_test.go:
  - stubOIDCSvc gains testResult + testErr fields + TestDiscovery
    method so it satisfies the inline interface.
  - 3 regression tests: happy path, missing issuer_url -> 400,
    discovery-failure -> 200 with errors[] populated.

VERIFY.

- go vet ./internal/auth/oidc/... ./internal/api/handler/...
  ./internal/api/router/...                                   PASS
- go test -short -count=1 -run TestProvider
  ./internal/api/handler/...                                  PASS (3/3)
- go test -short -count=1 ./internal/auth/oidc/...            PASS (3.7s)
- go test -short -count=1 ./internal/api/handler/...          PASS (4.7s)

Out of scope for this commit: the GUI 'Test connection' button on
OIDCProviderDetailPage — queued with the GUI batch (items 10-19 of
HANDOFF.md).

Refs: cowork/auth-bundles-audit-2026-05-10.md MED-5
      cowork/auth-bundles-fixes-2026-05-10/HANDOFF.md item 2

internal/api/router/router.go

@@ -459,6 +459,10 @@ func (r *Router) RegisterHandlers(reg HandlerRegistry) {
 		r.Register("PUT /api/v1/auth/oidc/providers/{id}", rbacGate(reg.Checker, "auth.oidc.edit", reg.AuthSessionOIDC.UpdateProvider))
 		r.Register("DELETE /api/v1/auth/oidc/providers/{id}", rbacGate(reg.Checker, "auth.oidc.delete", reg.AuthSessionOIDC.DeleteProvider))
 		r.Register("POST /api/v1/auth/oidc/providers/{id}/refresh", rbacGate(reg.Checker, "auth.oidc.edit", reg.AuthSessionOIDC.RefreshProvider))
+		// Audit 2026-05-10 MED-5 — dry-run validator for OIDC provider
+		// config. Returns discovery + JWKS + alg-downgrade + iss-param
+		// reachability without persisting.
+		r.Register("POST /api/v1/auth/oidc/test", rbacGate(reg.Checker, "auth.oidc.create", reg.AuthSessionOIDC.TestProvider))
 
 		// Group-mapping CRUD.
 		r.Register("GET /api/v1/auth/oidc/group-mappings", rbacGate(reg.Checker, "auth.oidc.list", reg.AuthSessionOIDC.ListGroupMappings))