ABI Layer 2: prove progressive-disclosure monotonicity — flagship Idris2 proof#38
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Add Mylangiser.ABI.Semantics, a machine-checked flagship proof for the
headline domain property: progressive-disclosure interfaces only ever ADD
revealed items across steps, never remove a previously-shown one.
Model: a disclosure run is a sequence of revealed-item sets (List (List Nat)).
A valid step Reveal before after exists only when Subset before after holds
(every item visible before is still visible after) — there is no constructor
that drops a revealed item. MonotoneRun is the transitive closure over steps.
Includes a sound+complete decision procedure (decSubset, decReveal, decRun),
a certifier into the ABI Result type with a soundness lemma (certifyRunSound),
a positive control (goodRunMonotone: {1}->{1,2}->{1,2,3}) and a negative
control (hidingStepInvalid / hidingRunNotMonotone: {1,2}->{1} has no valid
transition proof). No believe_me/postulate/assert — fully total.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01A6PSzJWpRxtzGDjUCEh7Mx
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Summary
Raises mylangiser's Idris2 ABI to Layer 2 with its first flagship semantic proof. mylangiser's headline is generating progressive-disclosure interfaces; the correctness property is monotonicity — a disclosure run only ever adds revealed items, never hides one already shown. This proves a run is monotone with a sound+complete
Decand certifier; a step that removes a previously-revealed item has no valid-transition proof.Mirrors the estate flagship-proof pattern: disclosure model, monotonicity proposition, sound+complete
Dec, certifier proven sound, positive + negative controls.Changes
src/interface/abi/Mylangiser/ABI/Semantics.idr— aRun/monotonicity model, sound+complete decision,certifyRun/soundness, positive + negative controls.mylangiser-abi.ipkg.RSR Quality Checklist
Required
As Applicable
Testing
Verified with Idris2 0.7.0:
idris2 --build mylangiser-abi.ipkg→ exit 0, zero warnings. Adversarial check: a deliberately-false proof was rejected.build/removed.🤖 Generated with Claude Code
https://claude.ai/code/session_01A6PSzJWpRxtzGDjUCEh7Mx
Generated by Claude Code