fix(opencode): preserve Qwen system-message compatibility - #11

Summary

• add configurable, case-insensitive model glob compatibility rules for stable recall context injection
• default Qwen 3.6 models to synthetic user text so strict gateways receive a single system message
• preserve system-context injection and prompt-cache behavior for all other models
• prepare synchronized 0.7.2 release metadata

Closes anomalyco/opencode#20785 contextually; the upstream issue demonstrates the same strict Qwen system-message behavior.

Validation

• cargo fmt --all -- --check
• cargo clippy --workspace --all-targets --locked -- -D warnings
• cargo test --workspace --locked
• root data-tools npm run build
• OpenCode plugin npm run typecheck
• OpenCode plugin npm test (52 passed)
• OpenCode plugin npm run pack:check
• synchronized Cargo/root npm/plugin versions: 0.7.2

Compatibility

The new systemContextUserTextModelPatterns option defaults to ["*qwen3.6*"]. Users may add patterns for other strict gateways or set [] to disable the fallback. Title and compaction isolation, idempotent transforms, fail-open behavior, and non-matching model behavior remain unchanged.