feat(P05): ship infrastructure — Gitea API client, release notes, npm publishConfig, ciagent projects cmd, --project flag

---ci---
phase: 5
milestone: v1.0
plan: 05
task: SHIP-01-04 MULTI-01 MULTI-02
status: execute
---/ci---

src/core/index.ts

@@ -8,5 +8,7 @@ export { GitContext } from "./git-context.js";
 export { GitBranch } from "./git-branch.js";
 export { CommitBuilder } from "./commit-builder.js";
 export { extractCIAgentBlock, parseCIAgentBlock, parseCommitMessage } from "./commit-parser.js";
+export { GiteaClient, generateReleaseNotes } from "./gitea.js";
+export type { GiteaReleaseConfig, GiteaRelease } from "./gitea.js";
 export type { CIAgentConfig } from "../types/config.js";
 export { DEFAULT_CIAGENT_CONFIG } from "../types/config.js";