Add token-budgeted observation delta (what changed)#375
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serialize_observation renders one full frame (blows the token budget every turn); element_diff gives the stable-ID correspondence but stops at element pairs. Add the missing serializer: diff two frames, classify matched elements as changed or stable, render only the churn as +/~/- lines (added & changed first, stable dropped, capped at max_lines). Reuses element_diff.match_elements and observation.observation_index.
Up to standards ✅🟢 Issues
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| Metric | Results |
|---|---|
| Complexity | 36 |
| Duplication | 1 |
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Summary
Adds
delta_observation/delta_index/summarize_delta— a compact, indexed, budget-capped "what changed since last step" summary for agent loops.observation.serialize_observationrenders one full frame (re-feeding it every turn blows the token budget the module exists to respect);element_diffgives the stable-ID correspondence but stops at matched/added/removed element pairs. This is the missing serializer that turns those into a model-ready delta.It diffs the previous and current observation, classifies each matched element as changed (role/name/enabled/value/moved) or stable, and renders only the churn —
+ [i] role "name"(appeared) /- role "name"(vanished) /~ [i] role "name" (fields)(changed) — added & changed first, stable dropped, capped atmax_lines. Reuseselement_diff.match_elements(overlap join) +observation.observation_index(reading-order indexing). Pure-stdlib; Qt-free.Layers
utils/observation_delta/—delta_index,summarize_delta,delta_observation.je_auto_control+__all__.AC_delta_observation→{summary, added, removed, changed}.ac_delta_observation(read-only).Tests
test/unit_test/headless/test_observation_delta_batch.py— added/removed/changed/stable classification, moved-is-a-change, summary markers + stable omitted, max_lines budget truncation with(+N more), end-to-enddelta_observation, full wiring + facade exports. 7 passed. ruff / bandit / radon / float-scan / Qt-free all clean.