feat: initial harness spec v1.0.0 + reference template

Adds the normative contract every platform agent must conform to, plus a
working reference template under template/ that ticks every box out of
the box.

Spec is derived from the production agents shipped in
cjot-backstage-az/agents/ on branch sandbox/jonathan:
  - agent-registry, agent-factory, decomposer, discovery-agent,
    golden-path, modernization-factory, modernization-factory-v2,
    policy-transformer, scaffold-agent, support-intake-agent, the-watcher

Contents:
  - SPEC.md          normative contract (13 sections + conformance checklist)
  - CHANGELOG.md     spec versioning (1.0.0)
  - docs/
      registration.md   self-registration with the agent-gateway
      observability.md  OTel logs/metrics/traces wiring
      manifest.md       /.well-known/agent.json schema + AgentSkill
                        serialisation (pydantic vs protobuf)
      kubernetes.md     k8s deployment shape, mandatory cross-refs,
                        per-namespace agents, resource sizing
      deployment.md     .image-version, ACR build, deploy scripts, rollback
      deviations.md     tracked debts against the spec
  - template/
      .env.local.example, .gitignore, .image-version (0.1.0),
      Dockerfile (python:3.12-slim, non-root UID 1001, HEALTHCHECK),
      requirements.txt (harness floor + optional LLM stack),
      app/agent.py (Starlette entry, lifespan + self-registration,
                    defensive _skill_dict for pydantic vs protobuf),
      app/logging_setup.py (canonical OTel log bridge — copy verbatim),
      app/metrics.py (meter + example counter/histogram),
      app/skills.py (AGENT_CONFIG + AgentSkill list),
      k8s/configmap.yaml + deployment.yaml (Deployment + Service,
                                            OTel annotations + 6-var env block,
                                            agents-sa + agents-kv-spc bindings),
      scripts/deploy.sh (auto-bump + az acr build + apply + rollout),
      scripts/full-deploy.sh (preflight + deploy + post-deploy smoke),
      scripts/deploy-local.sh (docker/podman + .env.local)

template/scripts/deploy-local.sh

@@ -0,0 +1,38 @@
+#!/bin/bash
+# deploy-local.sh — Build the image locally and run it against .env.local.
+#
+# Useful for iterating on prompts/skills without touching the cluster.
+
+set -euo pipefail
+
+SCRIPT_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+AGENT_DIR=$(cd "${SCRIPT_DIR}/.." && pwd)
+
+APP_NAME="<agent-name>"
+PORT=8000
+ENV_FILE="${AGENT_DIR}/.env.local"
+
+if [ ! -f "${ENV_FILE}" ]; then
+  echo "ERROR: ${ENV_FILE} not found. Copy .env.local.example first." >&2
+  exit 1
+fi
+
+# Pick docker or podman
+if command -v docker >/dev/null; then
+  RUNTIME=docker
+elif command -v podman >/dev/null; then
+  RUNTIME=podman
+else
+  echo "ERROR: neither docker nor podman found on PATH" >&2
+  exit 1
+fi
+
+echo "Building ${APP_NAME}:local with ${RUNTIME}..."
+"${RUNTIME}" build -t "${APP_NAME}:local" "${AGENT_DIR}"
+
+echo "Running ${APP_NAME}:local on http://localhost:${PORT} ..."
+exec "${RUNTIME}" run --rm -it \
+  --name "${APP_NAME}" \
+  -p "${PORT}:${PORT}" \
+  --env-file "${ENV_FILE}" \
+  "${APP_NAME}:local"