Add Zopu dev bootstrap: git runtimes, Codex agent-os, dev agent

A vertical slice to bootstrap the product loop on the canonical zopu-code repo.

Primitives (packages/primitives, all tested + lint/type clean):
- GitRemoteRuntime: Gitea REST client (createIssue, createBranch,
  createPullRequest, listIssues, getIssue) as an Effect context service with
  a fetch-backed transport. Live-verified against puter/zopu-code.
- GitLocalRuntime: clone, addWorktree, commit, push, currentBranch,
  setRemoteUrl over a pluggable Shell (host subprocess now, AgentOS VM exec
  later). Tested against real temp git repos.
- agent-os: Codex support via @agentos-software/codex-cli — codexSoftware
  bundle (codex+git), makeCodexAgentOsConfig(), codexSessionEnv() for the
  OpenAI base URL/key.

Env:
- GITEA_URL/GITEA_TOKEN wired into convex.ts and convex.config.ts.
- .env.example documents the self-hosted git section.

Agents (packages/agents):
- zopu-dev: development agent that creates issues on the canonical repo and
  starts autonomous work runs. git-remote tools (create/list/branch/PR) wired
  to GitRemoteRuntime; start_workflow tool enqueues a work run.
- flue run zopu-dev verified live (lists/creates issues on real Gitea).

Backend (packages/backend):
- workflows.startIssueWork mutation: fetches a Gitea issue server-side and
  admits a queued work run. The Codex VM spawn body is the next step.

packages/primitives/package.json

@@ -7,10 +7,12 @@
     ".": "./src/index.ts",
     "./agent-os": "./src/agent-os.ts",
     "./git": "./src/git.ts",
+    "./git-local-runtime": "./src/git-local-runtime.ts",
+    "./git-remote-runtime": "./src/git-remote-runtime.ts",
     "./project": "./src/project.ts",
     "./project-issue": "./src/project-issue.ts",
-    "./project-workspace": "./src/project-workspace.ts",
     "./project-work": "./src/project-work.ts",
+    "./project-workspace": "./src/project-workspace.ts",
     "./signal": "./src/signal.ts",
     "./smoke": "./src/smoke.ts"
   },
@@ -22,7 +24,8 @@
   "dependencies": {
     "@agentos-software/git": "0.3.3",
     "@rivet-dev/agentos": "catalog:",
-    "effect": "catalog:"
+    "effect": "catalog:",
+    "@agentos-software/codex-cli": "0.3.4"
   },
   "devDependencies": {
     "@code/config": "workspace:*",