v0.3.0

What changed

Hardening pass driven by issue #1.

Documentation

• SKILL.md rewritten — more concise, tool-agnostic, operationally reliable. Standardized sections: Quick Reference, Protocol Rules, Standard Workflow (start → initialize → session/new → session/prompt → stream parsing → cancel), Resume Session, Polling/Timeout Strategy, Failure Modes, Update Procedure, Implementation Notes.
• Frontmatter description rewritten to state trigger conditions and intended programmatic use.
• All examples now use opaque session ids, newline-delimited JSON-RPC framing, and notification handling. Host-specific process.write/poll/kill API assumptions removed in favor of tool-agnostic guidance.
• cwd normalization and deterministic JSON serialization rules added.

Community files

• CODE_OF_CONDUCT.md (Contributor Covenant v2.1)
• CONTRIBUTING.md
• .github/ISSUE_TEMPLATE/bug_report.md
• .github/ISSUE_TEMPLATE/feature_request.md

Tests

• tests/test_acp_demo.py — 12 pytest cases covering frame() / read_frame() helpers and CLI smoke tests for --help, --dry-run, and --no-prompt.
• pytest.ini for test discovery.
• CI now runs pytest alongside markdownlint, lychee, and ruff.

Misc

• README badges added (license, protocol, OpenCode version, Python, CI, version, release).
• .gitignore extended to ignore test caches and virtualenvs.
• acp_demo.py clientInfo.version and _meta.json version aligned to 0.3.0.
• ruff --fix applied to acp_demo.py (typing modernization).

Closes #1.