docs(P21): rewrite README + normalize modules terminology (REQ-52,55,56,57,58,59,60)

---ci---
project: acdl
phase: 21
milestone: v1.6
status: execute
---/ci---

README.md rewrite:
- Remove all .ciagent/ references (links + repository-layout row).
- Remove .gitea/workflows/ row from repository layout.
- Restate repository roles: consumer repo = app code + 1+ contracts +
  CI definitions (thin .github/workflows/*.yml uses:-ing the central
  workflow); platform repo owns modules/adapters/core/schemas/pipelines/
  scripts/workflows.
- Replace Status section with Features list (consumer + platform-engineer
  referenceable) + Roadmap (planned only, no version changelog, no
  internal CIAgent status). Includes the composition-redesign roadmap
  entry (dynamic module creation from a contract).
- Fix the mermaid flowchart: all node text visible (short multi-line
  labels via <br/>), add a security-checks stage before policy checks,
  do not name specific tools (security checks/policy checks/infrastructure
  plan via adapter), add infrastructure-apply stage (dev only, after
  evidence event).
- Remove the environments table (dev/qa/prod/dr) completely; point to
  docs/environments/ for platform-managed environments.
- Credentials section: remove go-gitea/gitea#36988 blocked mention +
  waivers D-039/D-047 language. State OIDC+ABAC default; alternative is a
  static AWS key (GitHub Secrets for platform-runner runs, .env.secrets
  locally) with daily rotation (platform-managed) or out-of-band rotation
  (consumer-managed for local .env.secrets).
- forge -> platform runners / platform-managed throughout.
- Links point to docs/ Pages paths, not .ciagent/.

modules/ terminology:
- modules/README.md: L1 primitives -> primitives, L2 compositions ->
  modules, composition -> pattern (prose); add roadmap note for the
  composition redesign.
- README-TEMPLATE.md: L1 primitive -> primitive.
- All 7 L1 READMEs: L1 primitive -> primitive.
- L2 static-asset + microservice READMEs: L2 composition -> module
  pattern, composition -> pattern, L1 -> primitive; bump stale @v1 ->
  @v1.4 in usage examples; fix CONSUMER_GUIDE.md -> consumer-guide.md
  link.

Verification: grep sweeps for .ciagent/.gitea/forge/go-gitea/waiver/
D-039/D-047/acdl_platform in docs/ README.md modules/ contracts/ all
return 0 hits. Tests: 166 pass. run_ci.sh green.

modules/l1/alb/README.md

@@ -1,6 +1,6 @@
 # alb — Application Load Balancer (load balancer + target group + listener)
 
-> **Module kind:** L1 primitive  |  **Version:** 1.0.0
+> **Module kind:** primitive  |  **Version:** 1.0.0
 
 An Application Load Balancer with a target group and a listener. This is
 a multi-resource module: it creates a load balancer, a target group, and

modules/l1/ecr/README.md

@@ -1,6 +1,6 @@
 # ecr — ECR repository
 
-> **Module kind:** L1 primitive  |  **Version:** 1.0.0
+> **Module kind:** primitive  |  **Version:** 1.0.0
 
 A single ECR repository that hosts the container image for the ECS
 task. The simplest container-registry module — one resource, two

modules/l1/ecs-cluster/README.md

@@ -1,6 +1,6 @@
 # ecs-cluster — ECS Fargate cluster
 
-> **Module kind:** L1 primitive  |  **Version:** 1.0.0
+> **Module kind:** primitive  |  **Version:** 1.0.0
 
 An ECS Fargate cluster. The simplest ECS module — one resource, two
 inputs, two outputs. The cluster is the container orchestration

modules/l1/ecs-service/README.md

@@ -1,6 +1,6 @@
 # ecs-service — ECS Fargate service (task definition + service)
 
-> **Module kind:** L1 primitive  |  **Version:** 1.0.0
+> **Module kind:** primitive  |  **Version:** 1.0.0
 
 An ECS Fargate service with its task definition. Runs a container image
 on Fargate, optionally behind an ALB target group. This is a

modules/l1/iam-role/README.md

@@ -1,6 +1,6 @@
 # iam-role — IAM role
 
-> **Module kind:** L1 primitive  |  **Version:** 1.0.0
+> **Module kind:** primitive  |  **Version:** 1.0.0
 
 A single IAM role with an assume-role policy and optional managed
 policy attachments. Used as the ECS task execution role.

modules/l1/s3/README.md

@@ -1,6 +1,6 @@
 # s3 — S3 bucket
 
-> **Module kind:** L1 primitive  |  **Version:** 1.0.0
+> **Module kind:** primitive  |  **Version:** 1.0.0
 
 A single S3 bucket for object storage. The simplest module — one
 resource, two inputs, two outputs. Versioning is enabled by default.

modules/l1/vpc/README.md

@@ -1,6 +1,6 @@
 # vpc — VPC with subnets and routing
 
-> **Module kind:** L1 primitive  |  **Version:** 1.0.0
+> **Module kind:** primitive  |  **Version:** 1.0.0
 
 A VPC with one subnet per availability zone and a route table with a
 default route through an internet gateway. The networking foundation