Files
pxpipe/tests
teamchong fe6b0ec2a8 feat: structure-through role attribution + turn-index recency anchor for history images
Collapsed-history images now carry who-said-what AND when, instead of leaving
the model to reconstruct it from a flattened, role-ambiguous blob (which led it
to resurface the opening turn as if it were the live request).

- Turn-index recency anchor: each collapsed turn serializes as <user t="N"> /
  <assistant t="N"> with an ABSOLUTE turn index (larger N = more recent), so the
  model can tell turn 1 from turn 60. Absolute (never "N ago"/"i of total") so
  frozen chunks stay byte-identical and keep hitting the prompt cache. Mirrored on
  the GPT path. (history.ts, openai-history.ts, openai.ts)
- colorByRole: role tags are tinted via a parallel "slot string" carried from
  serialize time (structure-through), replacing the parse-back that miscolored a
  body quoting a literal <tag>. (render.ts, history.ts)
- neutralizeSentinel: a pre-existing ↵ (U+21B5) in content is swapped to ⏎
  (U+23CE) in render-prep so reflow packs newlines instead of bailing to a raw,
  unpacked render — common when the content is about pxpipe itself. Render-only;
  originals preserved. (render.ts, transform.ts, history.ts, openai-history.ts)
- Per-model GPT vision/render profiles, retunable via PXPIPE_GPT_PROFILES,
  behavior-identical to the old hardcoded values. (gpt-model-profiles.ts)

Review fixes folded in:
- Banner intro/outro consolidated to a single source of truth; the GPT path now
  aliases the Anthropic constant instead of byte-copying it (can't drift).
- slotCopyBody neutralizes literal slot markers to a width-equivalent control
  char (U+0003), not a space the minifier would strip and misalign.

459 tests pass; tsc clean.
2026-06-21 17:17:08 -04:00
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