feat(dogfood): integrate and document complete v0 loop

Extend the smoke harness with Orb execution-plane preflight probes
(Docker, OpenCode, Gitea reachability/creds/PR-creation, repository
writable) that report BLOCKED with exact reasons when dependencies are
absent. Add scripts/orb-project-run.ts as the missing connection point
between OrbProjectManager and the Orb/Git lifecycle. Write
docs/DOGFOOD_V0.md covering architecture, startup order, env vars,
local/server flows, demo procedure, health checks, failure recovery,
cleanup, known limitations, and next milestones.

The smoke harness now runs 18 preflight checks across control-plane and
Orb execution-plane layers, all with stable markers and sanitized JSON
reports. The orb:run script (ORB_RUN=1) drives one issue through the
full Orb project-manager lifecycle.

packages/env/src/smoke.ts

@@ -9,9 +9,13 @@ const smokeEnvSchema = z.object({
   cpaApiKey: z.string().min(1),
   cpaBaseUrl: z.url(),
   daemonId: z.string().min(1),
+  dockerImage: z.string().min(1).optional(),
   featureRequest: z.string().min(10),
   flueUrl: z.url(),
+  giteaToken: z.string().min(1).optional(),
+  giteaUrl: z.url().optional(),
   projectId: z.string().min(1).optional(),
+  repositoryPath: z.string().min(1).optional(),
   webUrl: z.url(),
 });
 
@@ -31,6 +35,7 @@ export const parseSmokeEnv = (
     cpaBaseUrl:
       runtimeEnv.ZOPU_SMOKE_CPA_BASE_URL ?? runtimeEnv.AGENT_MODEL_BASE_URL,
     daemonId: runtimeEnv.ZOPU_SMOKE_DAEMON_ID ?? runtimeEnv.DAEMON_ID,
+    dockerImage: runtimeEnv.ORB_DOCKER_IMAGE,
     featureRequest:
       runtimeEnv.ZOPU_SMOKE_FEATURE_REQUEST ??
       "Add a tiny accessible status control to the existing web project's primary page, keep existing behavior unchanged, and add a focused test for it.",
@@ -38,7 +43,11 @@ export const parseSmokeEnv = (
       runtimeEnv.ZOPU_SMOKE_FLUE_URL ??
       runtimeEnv.VITE_FLUE_URL ??
       "http://localhost:3583",
+    giteaToken: runtimeEnv.GITEA_TOKEN ?? runtimeEnv.ZOPU_SMOKE_GITEA_TOKEN,
+    giteaUrl: runtimeEnv.GITEA_URL ?? runtimeEnv.ZOPU_SMOKE_GITEA_URL,
     projectId: runtimeEnv.ZOPU_SMOKE_PROJECT_ID,
+    repositoryPath:
+      runtimeEnv.ZOPU_SMOKE_REPOSITORY_PATH ?? runtimeEnv.GITEA_REPOSITORY_PATH,
     webUrl:
       runtimeEnv.ZOPU_SMOKE_WEB_URL ??
       runtimeEnv.SITE_URL ??