Add AILint guarantees and non-guarantees documentation

This document outlines the guarantees and non-guarantees of AILint, including aspects like declaration fidelity, interpretation stability, and limitations on authorship and detection accuracy.

spec/guarantees.md

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+AILint Guarantees and Non-Guarantees (v1.0)
+1. Purpose
+
+This document defines what AILint explicitly guarantees — and what it explicitly does not guarantee.
+
+This clarity is essential to prevent:
+
+misuse,
+
+over-interpretation,
+
+legal or ethical ambiguity.
+
+2. Guarantees (Normative)
+
+AILint guarantees the following only when explicit provenance is present.
+
+2.1 Declaration Fidelity
+
+If a valid AILint Provenance Statement exists, AILint guarantees that:
+
+the declaration is preserved as-is,
+
+no heuristic logic overrides it,
+
+no inference contradicts it.
+
+2.2 Interpretation Stability
+
+Given the same provenance input:
+
+AILint MUST produce consistent interpretation
+
+Results MUST NOT vary by environment or user
+
+2.3 Non-Surveillance Guarantee
+
+AILint guarantees that:
+
+no behavioral monitoring is required by the spec
+
+no typing, timing, or productivity metrics are mandated
+
+provenance is content-centric, not person-centric
+
+2.4 Loss Safety
+
+AILint guarantees that:
+
+removing markers does not alter content meaning
+
+missing provenance is treated as unknown, not false
+
+2.5 Forward Compatibility
+
+AILint guarantees that:
+
+unknown fields are ignored safely
+
+older provenance remains valid in newer versions
+
+3. Non-Guarantees (Explicit)
+
+AILint explicitly does not guarantee:
+
+3.1 Authorship or Ownership
+
+AILint does not:
+
+assert legal authorship
+
+establish copyright ownership
+
+replace attribution requirements
+
+3.2 Detection Accuracy
+
+AILint does not guarantee:
+
+accurate detection of undeclared AI usage
+
+absence of false positives or negatives
+
+identification of specific models or tools
+
+Inference is always best-effort.
+
+3.3 Intent or Responsibility
+
+AILint does not:
+
+infer intent
+
+assign responsibility
+
+evaluate ethics or compliance
+
+3.4 Content Quality
+
+AILint does not:
+
+judge correctness
+
+assess safety
+
+validate factual accuracy
+
+4. Heuristic Interpretation Disclaimer
+
+When explicit provenance is absent:
+
+heuristic analysis MAY be used
+
+results MUST be labeled probabilistic
+
+confidence MUST be surfaced
+
+conclusions MUST be non-binding
+
+5. Legal and Organizational Boundary
+
+AILint is:
+
+a technical signaling system
+
+not a policy enforcement engine
+
+not a compliance framework
+
+Organizations adopting AILint:
+
+remain responsible for governance
+
+MUST NOT treat AILint output as sole evidence
+
+6. Summary
+
+AILint provides clarity, not certainty.
+Signals, not verdicts.
+Provenance, not policing.