Add v0.1.0 rules: S002, S007, S008

[hermanngeorge15]

Context

The CLAUDE.md spec defines 3 additional rules for v0.1.0:

ID	Name	Severity	Description
S002	testable-criteria	warning	Acceptance criteria must contain measurable language (not "make it good")
S007	imperative-constraints	warning	Constraints should use must/should/never, not vague language
S008	no-conflicting-language	error	Detect contradictory constraints

Implementation Notes

• S002: Look for vague words ("good", "fast", "nice", "better") in acceptance criteria sections. Flag items without measurable language (numbers, percentages, specific behaviors).
• S007: Scan Constraints section for weak language ("it would be nice", "try to", "consider"). Require imperative verbs (must, should, never, always).
• S008: Hardest rule — detect contradictory pairs like "use TypeScript" + "use Python for scripts". Needs keyword-pair detection or semantic similarity.

Acceptance Criteria

• Each rule has >=3 pass and >=3 fail test cases
• S008 handles at least 5 common contradiction patterns
• All registered in rules/index.ts
• README rules table updated

Labels

enhancement, v0.1.0