Add bin/ci script and AGENTS.md for ChatGPT Codex support

Author: rsmithlal

AGENTS.md

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+# AGENTS.md
+
+## Project
+- Ruby: 3.4.4 (installed via rbenv in setup)
+- Rails: 7.1
+- Node: 20
+- DB: PostgreSQL + PostGIS
+- Search: Elasticsearch 7.17.23
+- Test app: `spec/dummy`
+
+## Setup
+- Environment runs a setup script that installs Ruby 3.4.4, Node 20, Postgres + PostGIS, and ES7, then prepares databases.
+- Databases:
+  - development: `community_engine_development`
+  - test: `community_engine_test`
+- Use `DATABASE_URL` to connect (overrides fallback host in database.yml).
+
+## Commands
+- Run tests: `bin/ci`  
+  (Equivalent: `cd spec/dummy && bundle exec rspec`)
+- Lint: `bundle exec rubocop`
+- Security: `bundle exec brakeman -q -w2` and `bundle exec bundler-audit --update`
+
+## Conventions
+- Make incremental changes with passing tests.
+- Avoid introducing new external services in tests; stub where possible.
+
+## Code Style
+- Always run `bin/codex_style_guard` before proposing a patch.
+- If RuboCop reports offenses after autocorrect, update the changes until it passes.

bin/ci

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+#!/usr/bin/env bash
+set -euo pipefail
+
+export RAILS_ENV="${RAILS_ENV:-test}"
+export NODE_ENV="${NODE_ENV:-test}"
+export DISABLE_SPRING=1
+
+# Ensure DB is ready (uses DATABASE_URL)
+cd spec/dummy
+bundle exec rails db:prepare
+
+# Optional: assets if your specs need them
+# bundle exec rails assets:precompile || true
+
+# Run specs from dummy
+bundle exec rspec --format documentation