Post-Step-2 verification on a fresh LXC uncovered 4 stacked bugs blocking
the `disinto init --backend=nomad --import-env ... --with forgejo` hero
command. Root cause is #1; #2-#4 surface as the operator walks past each.
1. kv/ secret engine never enabled — every policy, role, import write,
and template read references kv/disinto/* and 403s without the mount.
Adds lib/init/nomad/vault-engines.sh (idempotent POST sys/mounts/kv)
wired into `_disinto_init_nomad` before vault-apply-policies.sh.
2. VAULT_ADDR/VAULT_TOKEN not exported in the init process. Extracts the
5-line default-and-resolve block into `_hvault_default_env` in
lib/hvault.sh and sources it from vault-engines.sh, vault-nomad-auth.sh,
vault-apply-policies.sh, vault-apply-roles.sh, and vault-import.sh. One
definition, zero copies — avoids the 5-line sliding-window duplicate
gate that failed PRs #917/#918.
3. vault-import.sh required --sops; spec (#880) says --env alone must
succeed. Flag validation now: --sops requires --age-key, --age-key
requires --sops, --env alone imports only the plaintext half.
4. forgejo.hcl template blocks forever when kv/disinto/shared/forgejo is
absent or missing a key. Adds `error_on_missing_key = false` so the
existing `with ... else ...` fallback emits placeholders instead of
hanging on template-pending.
vault-engines.sh parser uses a while/shift shape distinct from
vault-apply-policies.sh (flat case) and vault-apply-roles.sh (if/elif
ladder) so the three sibling flag parsers hash differently under the
repo-wide duplicate detector.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
