feat(1d): G0 — generic install + deploy-once orchestrator (DG1 green on hedgedoc)

- harness/generic.py: recipe-agnostic assert_serving (converged + real HTTP, 404-excluded +
  not Traefik 404 body + CA-verified trusted wildcard cert), op helpers, backup_capable detect
- harness/discovery.py: per-op overlay resolution (repo-local > cc-ci > generic), custom + hook
- tests/_generic/: assertion-only tiers (install/upgrade/backup/restore) on the shared deployment
- run_recipe_ci.py: deploy-ONCE orchestrator, per-op summary, deploy-count guard (DG4.1)
- conftest live_app fixture; lifecycle deploy-count + install-steps hook + pin DOMAIN to run domain

DG1 cold-verified green on hedgedoc (pure generic, deploy-count=1, clean teardown). G0 CLAIMED.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

machine-docs/JOURNAL-1d.md

@@ -27,3 +27,42 @@ generic with extend-by-composition; deploy-ONCE with a deploy-count guard; base
 
 Seeded STATUS-1d / BACKLOG-1d / JOURNAL-1d. Next: implement G0 (generic.py + discovery.py +
 tests/_generic/ + deploy-once orchestrator), then verify generic install green on custom-html-tiny.
+
+## 2026-05-27 — G0 generic install + deploy-once orchestrator: DG1 GREEN
+
+Built the G0 machinery and proved DG1 end-to-end on the real server:
+- `runner/harness/generic.py` — `assert_serving` (services converged + real HTTP in HEALTH_OK [excludes
+  404] + not Traefik's 404 body + **CA-verified TLS cert is the trusted wildcard**), op helpers
+  (`do_upgrade`/`do_backup`/`do_restore`), `backup_capable` (scan compose for backupbot.backup).
+- `runner/harness/discovery.py` — per-op overlay resolution (repo-local > cc-ci > generic), custom
+  test discovery (both locations, additive), install-steps hook discovery.
+- `tests/_generic/test_{install,upgrade,backup,restore}.py` — assertion-only tiers using `live_app`.
+- `runner/run_recipe_ci.py` — deploy-ONCE orchestrator: base version (prev if upgrade+exists else
+  target), tiers run against the shared deployment, one teardown in finally, deploy-count guard +
+  per-op summary.
+- `tests/conftest.py` — `live_app` fixture (reads CCCI_APP_DOMAIN; tiers never deploy).
+- `lifecycle.deploy_app` — deploy-count recorder + install-steps hook + **pin DOMAIN to the run
+  domain** (fixes recipes whose .env.sample uses `{{ .Domain }}`, which this abra leaves unexpanded).
+
+**Two real generic bugs found+fixed via live runs (not "should work"):**
+1. custom-html-tiny deploy failed: `DOMAIN={{ .Domain }}` not auto-filled by `abra app new -D` on
+   0.13.0-beta → `can't evaluate field Domain`. Fix: `env_set(domain,"DOMAIN",domain)` in deploy_app.
+2. `served_cert_subject` used `openssl s_client`, but **openssl is not on the host** (`cc-ci-run`
+   runtimeInputs has no openssl) → it silently returned None → the "not default cert" check was a
+   no-op (a DG7 can't-fail smell). Replaced with a pure-Python **CA-verified handshake** (`ssl`):
+   a publicly-trusted LE wildcard verifies + matches hostname; Traefik's self-signed default fails
+   verification → a genuine assertion. Verified the verify path on the host:
+   `ssl.create_default_context()` against ci.commoninternet.net → VERIFIED, CN=*.ci.commoninternet.net,
+   SAN=[*.ci.commoninternet.net, ci.commoninternet.net].
+
+**DG1 evidence (cc-ci, final code):** custom-html-tiny is a static-web-server with an empty content
+volume → genuinely serves 404 zero-config (not a serving demo), so picked **hedgedoc** (simple
+category, NO cc-ci/repo-local tests → pure generic; backup-capable bonus):
+```
+$ RECIPE=hedgedoc STAGES=install cc-ci-run runner/run_recipe_ci.py
+===== TIER: install (generic: tests/_generic/test_install.py) =====
+tests/_generic/test_install.py::test_serving PASSED
+===== RUN SUMMARY =====   deploy-count = 1 (expect 1)   install : pass
+$ docker stack ls | grep hedg   -> (none — clean teardown)
+```
+Lint+format clean (`ruff check`/`ruff format --check` via `nix develop .#lint`). Claiming the G0 gate.