feat: add mops-cli agent skill

[Kamirus]

Summary

• Add an opinionated agent skill (.agents/skills/mops-cli/SKILL.md) that teaches AI agents how to use the mops CLI
• Covers the focused workflow: no dfx (pin moc in toolchain), no mo:base (use mo:core), all config in mops.toml, canister-centric check/build
• Documents moc args layering, check-stable setup, warning flags (M0223/M0236/M0237), toolchain management, and common patterns

Details

Key opinions encoded in the skill:

• Always pin moc and lintoko in [toolchain]; use latest for non-interactive setup
• Never pass file paths to mops check (exception: library packages without [canisters])
• Use mops check --fix as the primary correctness command (type-check + stable + lint in one pass)
• Create a trivial .most file for new projects instead of skipIfMissing = true
• Includes agent-specific notes (e.g. toolchain use without version is interactive — avoid)

Skipped commands: bench, publish, owner, maintainer, bump, set-network, get-network, search, info, cache, user, self, template, docs, sources, moc-args, check-candid, watch.

Test plan

• Verified all documented commands work (mops check, mops check backend, mops build, mops toolchain bin moc, etc.)
• Tested check-stable integration with deployed-compatible fixture
• Tested mops check src/**/*.mo for library packages in motoko-core
• Confirmed toolchain use moc latest is supported in the code
• Reviewed and simplified with post-implementation-reviewer subagent

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