Gadfly

The placement intervention ​

It replaces the workaround of making a second frame just to move one span, which loses a paired in-frame comparison and doubles setup.

Need ​

The essay treats each intervention as a change to the declared relation that keeps the rest of the encounter. presentation changes wording with a one-to-one rename, so it cannot test whether a span's place matters: a grant before or after an instruction, a caveat moved out of its section, or a code invariant moved away from the operation it governs.

Interface ​

It is one optional key of interventions:

json
{
  "interventions": {
    "ablation": true,
    "placement": {"span": "grant", "after": "audit"}
  }
}

The trial works like this:

  • span and after name distinct body spans.
  • The trial removes span from its current position and inserts it immediately after after; all span text is unchanged.
  • The frame is refused if the resulting order is identical to baseline.
  • The plan appends a placement trial after presentation and before bypass.
  • judge checks it immediately after the presentation rule. A changed level is coupled but misaligned: structure, not just wording, drove the observation.
  • The cost is one trial times quorum.

Contracts ​

  • The key is additive. Existing frame hashes and records are unchanged until a frame declares placement.
  • A new frame that uses it has a new hash.
  • The record format is unchanged; trial is placement.
  • The battery still never sees the trial id.
  • The After the Poem replay has no placement trial and its rule path is unchanged.
  • frame.py, interventions.py, verdict.py, the frame table, the trials table and the JSON Schema all know the key.

Tests ​

  1. A placement that reorders the body yields a distinct body_hash and a placement trial, planned after presentation and before bypass.
  2. A placement that leaves the order as it is, names itself or names a span not in the body is a FrameError before a call.
  3. A scorer whose label changes only under placement is coupled but misaligned, and a carried finding names placement among what held.
  4. A frame without placement keeps its hash.