chore: scaffold monorepo with spec/ Lean project and governance docs

- spec/: freshly initialized Lean library project (lake init, v4.31.0), no deps
- .gitea/workflows/spec-check.yml: CI running lake build on spec/ (well-formedness gate, not a spec-to-impl gate)
- README.md: monorepo overview + the 5 "constitution" rules positioning spec/ as upstream semantic master
- CLAUDE.md: global agent manual
- spec/README.md: contract writing conventions (prose+type, PINNED/OPEN/ADR tags, no sorry)
- docs/adr/0001-0004: system-level decision records (retrieved from main)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

This commit is contained in:

李知远

2026-06-21 22:00:18 +08:00

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				-- This module serves as the root of the `Spec` library.

				-- Import modules here that should be built as part of the library.

				import Spec.Basic