Add initial files

action.yml

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+name: Codex Bot
+description: Run Codex CLI for approved Gitea issue/PR automation
+
+inputs:
+  gitea-token:
+    required: true
+
+runs:
+  using: composite
+  steps:
+    # This step assumes this is `node:24-bookworm` container.
+    - name: Install dependencies
+      shell: bash
+      run: |
+        apt-get update
+        apt-get install -y --no-install-recommends gettext-base jq
+        npm install -g @openai/codex
+
+    - name: Run Codex Bot
+      shell: bash
+      run: bash "${ACTION_PATH}/scripts/run-codex.sh"
+      env:
+        ACTION_PATH: ${{ gitea.action_path }}
+        GITEA_API_URL: ${{ gitea.api_url }}
+        GITEA_REPOSITORY: ${{ gitea.repository }}
+        GITEA_TOKEN: ${{ inputs.gitea-token }}
+        ISSUE_INDEX: ${{ gitea.event.issue.number }}
+        COMMENT_BODY: ${{ gitea.event.comment.body }}

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}"