feat(seedgo): add Seed Go portable standards framework v1.0.0
Complete implementation of a plugin-based code standards checker.
Core Framework:
- CheckResult/CheckItem/Severity data models
- Three-source plugin discovery (builtin, entry_points, local)
- Config system (.seedgo/config.json) with profiles and overrides
- Severity-weighted scoring (errors block, warnings degrade, info reports)
CLI:
- seedgo init — create project config
- seedgo check — run all enabled plugins
- seedgo list — show available plugins
- Three output formats: human, json, github (CI annotations)
5 Starter Plugins:
- no-bare-except, type-hints-required, docstring-coverage
- function-length (no linter equivalent)
- file-structure (no linter equivalent)
354 tests, all passing.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
