feat(harness): P2 — delete legacy customization keys & paths (rcust)

a) compose.ccci.yml is FIRST-CLASS: the harness auto-copies tests/<recipe>/
   compose.ccci.yml into the run's recipe checkout (ABRA_DIR-aware, lifecycle.
   provide_ccci_overlay) and auto-chaoses the pinned base deploy on its presence
   (kills the R7 implicit coupling). ghost/discourse install_steps.sh (copy-only
   boilerplate) deleted; CHAOS_BASE_DEPLOY removed from both metas + the registry.

b) install-time deps wiring is the ONLY mode: deps with DEPS provision BEFORE the
   single deploy; legacy post-deploy provisioning + the setup_custom_tests.sh
   invocation machinery deleted. lasuite-docs migrated to install_steps.sh OIDC
   wiring (same env names/values as the old hook — only the timing moved);
   lasuite-drive's remaining post-deploy MinIO bucket one-shot moved to ops.py
   pre_install; both setup_custom_tests.sh files deleted; OIDC_AT_INSTALL removed
   from drive/meet metas + the registry.

c) SKIP_GENERIC meta key deleted (zero users). Env form CCCI_SKIP_GENERIC* stays
   as the documented dev-only escape hatch; when active in a drone CI run the
   orchestrator prints a loud !! warning (manifest embedding lands in P5).

d) conftest cleanup: dead pre-deploy-once fixtures deployed/deployed_app deleted
   (zero users), app_domain + _short + _wait_healthy dropped (only users were the
   deleted fixtures); deps_apps+deps_creds consolidated into ONE deps fixture
   (entries expose .domain etc. as attributes; dict access intact); the 6 lasuite
   test files renamed deps_creds->deps (fixture name only — assertions and flows
   byte-identical). requires_deps marker + F2-11 skip-report plumbing unchanged.

Registry is now exactly the 14 final keys; docs §4 table regenerated. Stale
setup_custom_tests/OIDC_AT_INSTALL prose in docstrings/comments/assert MESSAGES
updated (no assert logic or expected value touched).

Verified on cc-ci: cc-ci-run -m pytest tests/unit -q -> 175 passed; scripts/lint.sh -> PASS.

runner/harness/deps.py

@@ -20,7 +20,7 @@ Per Phase-2 DECISIONS:
 Run state:
 - `$CCCI_DEPS_FILE` — JSON file written by the orchestrator after each dep deploys; each entry is
   `{"recipe": "<dep-recipe>", "domain": "<dep-domain>", "version": null}`. Tests access via the
-  `deps_apps` pytest fixture defined in `tests/conftest.py`.
+  `deps` pytest fixture defined in `tests/conftest.py`.
 """
 
 from __future__ import annotations
@@ -50,11 +50,11 @@ def write_run_state(deps_state) -> None:
     """Write the deps state file ($CCCI_DEPS_FILE). Two shapes supported (canonical=keyed dict):
 
     1. **Legacy list-of-entries:** `[{"recipe": "<dep>", "domain": "<d>"}, ...]` (Q2.3 original).
-       Still accepted by `load_run_state` for backwards compat — `deps_apps` fixture flattens.
+       Still accepted by `load_run_state` for backwards compat — the `deps` fixture flattens.
     2. **NEW per-spec dict (operator-2026-05-28 SSO-dep plan §3.2):**
        `{"<dep_recipe>": {"recipe": "<dep>", "domain": "<d>", "realm": "...",
        "client_id": "...", "client_secret": "...", "admin_user": "...", "admin_password": "..."}}`.
-       The `setup_custom_tests.sh` per-recipe hook reads this via `jq` to wire OIDC env.
+       The per-recipe `install_steps.sh` hook reads this via `jq` to wire OIDC env.
 
     No-op if `$CCCI_DEPS_FILE` isn't set."""
     path = os.environ.get("CCCI_DEPS_FILE")
@@ -153,7 +153,7 @@ def load_run_state():
 
 
 def deps_as_dict(state) -> dict[str, dict]:
-    """Coerce either shape (legacy list or new dict) into a recipe→entry dict for the deps_apps
+    """Coerce either shape (legacy list or new dict) into a recipe→entry dict for the `deps`
     fixture + dependent-tests consumption."""
     if isinstance(state, dict):
         return state