Clarify EasyCom boundary prelabel taxonomy

adjudicate_easycom_eot_int_candidates.py

@@ -27,7 +27,7 @@ from easycom_event_taxonomy import EXCLUDE_REASONS, exclude_reason_group
 from prepare_easycom_eot_int_review import requires_semantic_adjudication
 
 
-PROMPT_VERSION = "easycom-wearer-boundary-semantic-prelabel-v15"
+PROMPT_VERSION = "easycom-wearer-boundary-semantic-prelabel-v16"
 DEFAULT_MODEL = "deepseek-v4-flash"
 DEFAULT_BASE_URL = "https://api.deepseek.com"
 VERDICTS = {"POSITIVE", "HARD_NEGATIVE", "EXCLUDE"}
@@ -107,7 +107,11 @@ Evidence rules:
    Apply this adjacency-pair rule before using brevity or later speaker activity as evidence: when a participant addresses the wearer with a question, request, proposal, or other first-pair part and the wearer supplies its contextually complete second-pair part, classify the wearer contribution as POSITIVE / WEARER_ENTRY. A polar-question answer such as "yes", "no", or "Nope." is complete even if it is one word and lasts less than one second. Reciprocal Target_of_Speech evidence (question targets wearer; answer targets questioner) strengthens this reading. Floor entry here means making the committed conversational response; it does not require monopolizing or retaining the floor afterward. Therefore, the questioner or another participant speaking after the answer does not turn that completed answer into a backchannel.
 
    Use HARD_NEGATIVE / ENTRY_WEARER_BACKCHANNEL only when the wearer vocalization functions merely as feedback on another participant's still-ongoing contribution and does not answer a question, accept or reject a proposal, provide requested information, or otherwise complete an adjacency pair. Lexical form alone is insufficient: "yeah" may answer a yes/no question or may be a continuer, depending on the preceding utterance and addressee evidence. For the supplied audit pattern, participant 3 asks the wearer "Have you ever analyzed documents?" and releases at 54.00 s; the wearer answers "Nope." at 54.15 s. This is POSITIVE / WEARER_ENTRY, not ENTRY_WEARER_BACKCHANNEL, even though it is brief and participant 3 later speaks again.
-6. For every WEARER_OFFSET, answer the central question: did the wearer stop because a non-wearer genuinely took over the conversational floor? Reconstruct the wearer activity-run start and offset, every nearby other onset and offset, which others are active immediately before and after the offset, whether each other is pre-existing or starts during wearer speech, whether it crosses the offset, overlap duration, who speaks next, transcript content, and Target_of_Speech. All temporal booleans are descriptive evidence, not prerequisite labels. A valid INT_YIELD may involve a newly entering or pre-existing competitor if the chronology and semantics establish genuine takeover and wearer relinquishment. Conversely, crossing the offset or satisfying t_w < t_o < t_y never proves takeover by itself. Verify that the relevant non-wearer actually takes and sustains the next floor. A different participant's later substantive turn is not evidence that the proposed competitor took over. Do not label INT_WEARER_HOLDS_FLOOR merely because the wearer speaks again later: if a competitor establishes an intervening substantive floor and the wearer has an intervening silent interval, the later wearer onset is a new WEARER_ENTRY and does not invalidate the earlier INT_YIELD. Natural completion, completion-to-silence, a within-turn wearer pause, or a post-completion other onset that could not have caused the stop is normally EXCLUDE unless the region is a valid named hard-negative opportunity. If the wearer reaches a semantically complete natural ending while overlapping activity is only [L] or feedback and that contributor does not take the next substantive floor, return EXCLUDE.
+6. For every WEARER_OFFSET, answer the central question: did the wearer stop because a non-wearer genuinely took over the conversational floor? Reconstruct the wearer activity-run start and offset, every nearby other onset and offset, which others are active immediately before and after the offset, whether each other is pre-existing or starts during wearer speech, whether it crosses the offset, overlap duration, who speaks next, transcript content, and Target_of_Speech. All temporal booleans are descriptive evidence, not prerequisite labels. A valid INT_YIELD may involve a newly entering or pre-existing competitor if the chronology and semantics establish genuine takeover and wearer relinquishment. Conversely, crossing the offset or satisfying t_w < t_o < t_y never proves takeover by itself. Verify that the relevant non-wearer actually takes and sustains the next floor. A different participant's later substantive turn is not evidence that the proposed competitor took over. Do not label INT_WEARER_HOLDS_FLOOR merely because the wearer speaks again later: if a competitor establishes an intervening substantive floor and the wearer has an intervening silent interval, the later wearer onset is a new WEARER_ENTRY and does not invalidate the earlier INT_YIELD.
+
+   Before deciding an offset, determine from transcript and chronology whether the wearer activity run ending there ever held the floor. If it is only a wearer backchannel embedded in a non-wearer's already ongoing turn, then the non-wearer's continuation across its offset is neither a takeover nor evidence that the wearer held the floor. Return EXCLUDE / OUT_OF_SCOPE_WEARER_BACKCHANNEL_OFFSET. The backchannel is scored once, at its wearer-onset ENTRY candidate, as HARD_NEGATIVE / ENTRY_WEARER_BACKCHANNEL; do not count its trailing offset again as an INT hard negative. For the supplied audit pattern, participant 1 speaks from 320.25 to 325.50 s while the wearer says only "Awesome." from 323.05 to 323.80 s. The wearer onset is an ENTRY_WEARER_BACKCHANNEL opportunity, while the wearer offset is OUT_OF_SCOPE_WEARER_BACKCHANNEL_OFFSET, not INT_WEARER_HOLDS_FLOOR and not INT_YIELD.
+
+   Natural completion, completion-to-silence, a within-turn wearer pause, or a post-completion other onset that could not have caused the stop is normally EXCLUDE unless the region is a valid named hard-negative opportunity. If the wearer reaches a semantically complete natural ending while overlapping activity is only [L] or feedback and that contributor does not take the next substantive floor, return EXCLUDE.
 7. Transcript event markers are evidence, not lexical turns. In EasyCom, a transcription consisting of [L] denotes laughter-only vocalization. Do not treat [L] as a sustained floor entry or interruption takeover merely because its activity interval creates an onset, offset, or overlap candidate. Specifically:
    - wearer [L] during a non-wearer's retained turn is normally HARD_NEGATIVE / ENTRY_WEARER_BACKCHANNEL, not WEARER_ENTRY;
    - non-wearer [L] overlapping a wearer's retained turn is normally HARD_NEGATIVE / INT_OTHER_BACKCHANNEL, not INT_YIELD;
@@ -121,6 +125,7 @@ Top-level verdicts:
 
 EXCLUDE requires exactly one exclude_reason from this closed taxonomy:
 - OUT_OF_SCOPE_NORMAL_COMPLETION: the wearer naturally completes; no interruption-yield target occurs.
+- OUT_OF_SCOPE_WEARER_BACKCHANNEL_OFFSET: the wearer activity run is only a backchannel inside a non-wearer's retained turn; its onset carries the ENTRY hard-negative opportunity, while this trailing offset is not scored again as INT.
 - OUT_OF_SCOPE_WITHIN_TURN_CONTINUATION: a raw boundary is only a pause/resumption within the same wearer contribution.
 - OUT_OF_SCOPE_POST_COMPLETION_ACTIVITY: another contribution begins only after wearer completion and cannot have caused the boundary.
 - OUT_OF_SCOPE_NON_EVENT: another clear, interpretable non-target boundary not covered above.