Reviewer 3.3 session-level reconstruction and reanalysis

RECONSTRUCTION
Retained JSON files in input ledger: 106
Excluded unverified fragments: 1
Final session-level units: 104
Participants represented: 39
Multi-file sessions: 1
Learner turns after consolidation: 2053
NPC responses after consolidation: 2053

REPETITION RESULTS
Affected sessions: 33/104 (31.7%)
Episodes: 54
NPC responses inside repeated runs: 190
Learner-repetition-positive sessions: 55/104
Learner repetition episodes: 92
Learner turns inside repeated runs: 262/2053
NPC/learner repetition co-occurrence: 31/33 NPC-positive sessions

FOUR-CELL COMPARISON
MA: 10/27 (37.0%)
MT: 5/29 (17.2%)
BA: 7/20 (35.0%)
BT: 11/28 (39.3%)
Pearson chi-square(3) = 3.998, p = 0.2617
Expected counts: [[18.43  8.57]
 [19.8   9.2 ]
 [13.65  6.35]
 [19.12  8.88]]

LOGISTIC REGRESSION: repetition ~ NPC turns + modality * language group
                                                          beta        se           p       OR    CI_low  CI_high
Intercept                                             -2.18308  0.693233  0.00163756 0.112694 0.0289613 0.438511
C(modality)[T.text]                                  -0.312899  0.689125    0.649791 0.731324  0.189464  2.82289
C(language_group)[T.monolingual]                     0.0858961  0.653235    0.895385  1.08969  0.302879  3.92048
C(modality)[T.text]:C(language_group)[T.monolingual] -0.450844   0.96372    0.639916  0.63709 0.0963565  4.21232
npc_turns                                            0.0792286 0.0234695 0.000735968  1.08245   1.03379  1.13341
N = 104; McFadden R2 = 0.1515

PARTICIPANT-CLUSTERED GEE (exchangeable working correlation)
                                                          beta        se           p       OR    CI_low  CI_high
Intercept                                             -2.18249  0.864841    0.011617 0.112761 0.0207016 0.614204
C(modality)[T.text]                                  -0.263174  0.910514    0.772552 0.768608  0.129025  4.57863
C(language_group)[T.monolingual]                     0.0586445  0.961474    0.951364   1.0604  0.161087  6.98035
C(modality)[T.text]:C(language_group)[T.monolingual] -0.539956   1.09205    0.620994 0.582774 0.0685403  4.95512
npc_turns                                            0.0793414 0.0216636 0.000249833  1.08257   1.03757  1.12953

AFFECTED-SESSION ONSET DESCRIPTION
N = 33; median onset = 7.0
Spearman rho(total NPC turns, onset) = 0.230, p = 0.1986
This affected-session analysis is descriptive and does not treat unaffected sessions as censored.
Total turn count is an exposure/opportunity variable, not a causal effect of dialogue length.
