fix(vault): rename applications.policies field to ops_policies (cms CI was silently missing its R2 policy)

The `applications` object field was declared `policies` in variables.tf, but
the cms tfvars entry, the runbook (doc/runbooks/new-web-app/03-vault-platform.md),
the guidebook (vibe/guidebooks/tools/secrets-and-vso.md) and the module input
(modules/app_policy variable `ops_policies`) all use the name `ops_policies`.

Because Terraform silently drops unknown attributes when converting a value to
an object() type, cms's `ops_policies = ["factory__cf_r2_arcodange_tf"]` was
discarded and `each.value.policies` fell back to [] — so gitea_cicd_cms never
received the `factory__cf_r2_arcodange_tf` token policy (read on
kvv1/cloudflare/r2/arcodange-tf + kvv1/zoho/self_client, defined in
factory iac/cloudflare.tf). cms CI was missing its Cloudflare R2 Terraform-state
permissions.

Fix at the root: rename the schema field `policies` -> `ops_policies` (and its
single reference main.tf:82 `each.value.policies` -> `each.value.ops_policies`),
aligning the whole chain. This is lower-churn than renaming the tfvars key (the
chosen alternative would also have required fixing the runbook + guidebook, which
both already document `ops_policies`) and prevents the next app created from the
runbook from re-introducing the same silently-dropped key.

Behavioural change: gitea_cicd_cms gains `factory__cf_r2_arcodange_tf` in its
token_policies. No other app sets this field (all default []), so no other role
changes. Reviewer: confirm the R2 policy is the intended grant for cms CI.

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

hashicorp-vault/iac/main.tf

@@ -79,7 +79,7 @@ module "app_policies" {
   for_each                   = { for app in var.applications : app.name => app }
   name                       = each.value.name
   envs                       = each.value.envs
-  ops_policies               = each.value.policies
+  ops_policies               = each.value.ops_policies
   service_account_names      = each.value.service_account_names
   service_account_namespaces = each.value.service_account_namespaces
   gitea_app_id               = var.gitea_app_id

hashicorp-vault/iac/variables.tf

@@ -12,7 +12,7 @@ variable "POSTGRES_CREDENTIALS_EDITOR_PASSWORD" {
 variable "applications" {
   type = set(object({
     name                       = string
-    policies                   = optional(list(string), [])
+    ops_policies               = optional(list(string), [])
     service_account_names      = optional(list(string), [])
     service_account_namespaces = optional(list(string), [])
     # Multi-env extension: list of envs this app deploys to. Defaults to ["prod"] for