feat: add OpenClaw agent integration

[AIstar007]

Description

Adds full support for [OpenClaw](https://openclaw.ai) as a new AI agent in Specify CLI.

OpenClaw is a persistent AI agent daemon that connects to messaging platforms (Telegram, WhatsApp, Slack, etc.) and uses a skill-based architecture — skills are discovered as directories containing a SKILL.md file under <workspace>/skills/, identical to the pattern used by Kimi Code.

Files changed:

• src/specify_cli/__init__.py — Added "openclaw" to AGENT_CONFIG with folder: ".openclaw/", commands_subdir: "skills", requires_cli: True, install_url: "https://openclaw.ai". Help text updates automatically via _build_ai_assistant_help().
• .github/workflows/scripts/create-release-packages.sh — Added openclaw to ALL_AGENTS and new create_openclaw_skills() function that generates .openclaw/skills/speckit-<command>/SKILL.md files with OpenClaw-compatible frontmatter.
• .github/workflows/scripts/create-release-packages.ps1 — Mirror of bash changes: New-OpenClawSkills function, 'openclaw' case in Build-Variant, 'openclaw' added to $AllAgents.
• scripts/bash/update-agent-context.sh — Added OPENCLAW_FILE="$AGENTS_FILE" (OpenClaw reads AGENTS.md from workspace root, same as amp, kiro-cli, bob), added openclaw) case in update_specific_agent() and update_if_new call in update_all_existing_agents().
• AGENTS.md — Added OpenClaw to supported agents table, CLI-based agents list, Markdown format section, and directory conventions.
• README.md — Added OpenClaw to supported agents table, --ai option description, specify check tools list, and examples section.
• templates/SKILL.md — New workspace-level skill manifest copied to .openclaw/skills/speckit/SKILL.md on specify init --ai openclaw --ai-skills.
• templates/skill-file-template.md — New per-command SKILL.md template used by install_ai_skills(), following the existing *-template.md naming convention.

Key design decisions:

• --ai-skills is the primary path for OpenClaw since it uses skill directories, not flat slash command files
• Skill naming uses dash separator (speckit-specify) vs Kimi Code's dot separator (speckit.specify)
• OPENCLAW_FILE points to AGENTS.md — the OpenClaw equivalent of CLAUDE.md for Claude Code
• generic remains last in all agent arrays

Testing

• Tested locally with uv run specify --help
• Ran existing tests with uv sync && uv run pytest
• Tested with a sample project (if applicable)

# openclaw appears in --ai help text
uv run specify init --help

# correct .openclaw/skills/ structure is generated
uv run specify init /tmp/test-openclaw --ai openclaw --ai-skills

# openclaw shows in tool check
uv run specify check

# release package builds correctly
AGENTS=openclaw SCRIPTS=sh .github/workflows/scripts/create-release-packages.sh v0.0.0-test

AI Disclosure

• I did not use AI assistance for this contribution
• I did use AI assistance (describe below)

Implementation approach and file structure were developed with AI assistance (Claude). All code was manually reviewed, tested end-to-end, and verified against existing agent integration patterns before submission.