feat: add configure-helm skill and update configure-route

[nickmarden]

• Move skills to agents/ directory (canonical location)
• Symlink from .claude/skills/ for Claude Code slash commands
• Update configure-route with all verifier types:
  • json_field (Microsoft Graph)
  • query_param (URL token)
  • header_query_param (encoded header params)
  • validators (JSON Schema)
  • preserve_host option
• Add configure-helm skill for complete K8s deployments:
  • Multiple routes configuration
  • Ingress/Gateway API options
  • TLS with cert-manager or built-in ACME
  • Secrets management
  • Redis/Valkey for multi-replica relay
  • gatekeeper-relay deployment
• Promote skills in README with new section
• Update docs/USAGE.md with both skills
• Add maintenance note to AGENTS.md

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[github-actions]

Docker Images Built

Images are available for testing:

# gatekeeperd
docker pull ghcr.io/tight-line/gatekeeperd:pr-12-2147144

# gatekeeper-relay
docker pull ghcr.io/tight-line/gatekeeper-relay:pr-12-2147144

docker-compose.yml

GATEKEEPERD_IMAGE=ghcr.io/tight-line/gatekeeperd:pr-12-2147144 \
RELAY_IMAGE=ghcr.io/tight-line/gatekeeper-relay:pr-12-2147144 \
docker-compose --profile relay up

Helm (values override)

image:
  repository: ghcr.io/tight-line/gatekeeperd  # or gatekeeper-relay
  tag: "pr-12-2147144"

Images expire ~15 days after PR closes.