docs: verify Codex marketplace readiness (#1931)

docs/releases/2.0.0-rc.1/naming-and-publication-matrix.md

@@ -44,6 +44,7 @@ Reason:
 | Claude marketplace entry | `ecc` | `.claude-plugin/marketplace.json` | Version and repo point at current rc.1 surface | Keep |
 | Codex plugin slug | `ecc` | `node -p "require('./.codex-plugin/plugin.json').name"` | `ecc` | Keep |
 | Codex plugin version | `2.0.0-rc.1` | `node tests/docs/ecc2-release-surface.test.js` | Release surface test passed | Ready for Codex marketplace/manual marketplace gate |
+| Codex repo marketplace | `ecc` | `.agents/plugins/marketplace.json`; `codex plugin marketplace add --help` | Repo marketplace add supports GitHub shorthand and local roots; local temp-home add smoke passed | Use as rc.1 Codex distribution path |
 | OpenCode package | `ecc-universal` | `node -p "require('./.opencode/package.json').name"` | `ecc-universal` | Keep |
 | OpenCode build | Generated package output | `npm run build:opencode` | Passed | Ready for package dry-run gate |
 | npm pack surface | Reduced runtime package | `npm pack --dry-run --json` | Produced `ecc-universal-2.0.0-rc.1.tgz`, 969 entries, about 5.0 MB unpacked | Needs final release-commit rerun |
@@ -56,7 +57,7 @@ Reason:
 | npm | `ecc-universal` local package version is `2.0.0-rc.1`; registry latest is `1.10.0` | Publish rc with `npm publish --tag next` after final `npm pack --dry-run` and release tests | Do not publish before final release commit |
 | Claude plugin | `claude plugin validate .claude-plugin/plugin.json` passed; `claude plugin tag --help` confirms the release tag flow creates `{name}--v{version}` tags and can push them | Run `claude plugin tag .claude-plugin --dry-run` from the clean release commit, then tag/push only after release approval | No plugin release tag created in this pass |
 | Claude marketplace | `.claude-plugin/marketplace.json` points at `ecc` and the public repo | Verify marketplace update/install path after tag exists | External marketplace propagation not verified |
-| Codex plugin | `codex plugin marketplace` supports add/upgrade/remove; `.codex-plugin/plugin.json` is present and release-surface tests pass | Confirm marketplace source format, then test add/upgrade from the public repo or marketplace source | No public Codex marketplace submission path verified in this pass |
+| Codex plugin | `codex plugin marketplace` supports add/upgrade/remove; `.codex-plugin/plugin.json` is present; `.agents/plugins/marketplace.json` exposes `ecc` from the repo root; temp-home local `codex plugin marketplace add` passed | Publish rc.1 docs with the repo-marketplace command, then monitor OpenAI's official Plugin Directory self-serve path | Official Plugin Directory publishing is documented as coming soon |
 | OpenCode package | `.opencode/package.json` builds from source and ships inside npm package | Re-run `npm run build:opencode` and package dry-run from release commit | OpenCode CLI 1.2.21 does not expose a separate plugin publication command in this pass |
 | ECC Tools billing claim | README and launch copy mention ECC Tools / marketplace context | ECC-Tools #73 adds `/api/billing/readiness` `announcementGate`; run it against a Marketplace-managed test account before any payment announcement | Billing announcement code gate exists; live Marketplace account readback still pending |
 | Social and longform copy | X thread, LinkedIn copy, article outline, GitHub release copy exist | Replace any stale URLs, then publish only after release/npm/plugin URLs work | Public URLs not final until release actions complete |
@@ -116,4 +117,12 @@ Passed.
 
 npm pack --dry-run --json
 Produced ecc-universal-2.0.0-rc.1.tgz, 969 entries, about 5.0 MB unpacked.
+
+codex plugin marketplace add --help
+Supports GitHub shorthand, HTTP(S) Git URLs, SSH URLs, local marketplace roots,
+--ref, and Git-only --sparse.
+
+HOME="$(mktemp -d)" codex plugin marketplace add <local-checkout>
+Added marketplace ecc and recorded the installed marketplace root as
+<local-checkout> without touching the real Codex config.
 ```