Add initial files

scripts/prompt.md

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+You are Codex running inside Gitea Actions.
+
+First read `.codex-bot/context.md`. Treat the triggering comment body below as
+the user's exact instruction.
+
+Write your final report to stdout. It will be posted back to Gitea as a comment
+automatically after Codex exits.
+
+Install missing tools yourself when needed, including Rust, uv, Node, Deno, or
+system packages.
+
+Prefer minimal, correct changes. Run relevant checks or tests if practical.
+Commit your changes locally. Do not expose secrets. Finish by reporting what
+changed and what tests ran.
+
+The triggering comment body is below.
+
+---
+
+${COMMENT_BODY}

scripts/run-codex.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+git config --global user.name bot
+git config --global user.email noreply@capsulizers.com
+
+FINAL_PROMPT="$(envsubst < "${ACTION_PATH}/scripts/prompt.md")"
+OUTPUT_FILE="$(mktemp)"
+
+set +e
+codex exec \
+  --full-auto \
+  --dangerously-bypass-approvals-and-sandbox \
+  "${FINAL_PROMPT}" > "${OUTPUT_FILE}" 2>&1
+CODEX_STATUS="${?}"
+set -e
+
+COMMENT_JSON="$(jq -n --rawfile body "${OUTPUT_FILE}" '{body: $body}')"
+curl --fail-with-body --silent --show-error \
+  -X POST \
+  -H "Authorization: token ${GITEA_TOKEN}" \
+  -H "Content-Type: application/json" \
+  --data "${COMMENT_JSON}" \
+  "${GITEA_API_URL}/repos/${GITEA_REPOSITORY}/issues/${ISSUE_INDEX}/comments"
+
+exit "${CODEX_STATUS}"