Release exp-v0.52.278: stop tearing live progress words (#7082, @ruizanthony)

[nesquena-hermes]

Release exp-v0.52.278 — stop tearing live progress words across block boundaries (#7082, @ruizanthony)

Ships #7082: fixes a client-side render artifact where live progress text in Transparent Stream could split a word across a block boundary and render the tail on its own line (e.g. Ces deu / x fichiers passent.). The streamed text was always intact — the tearing was purely in the live fade/reconcile render path.

The renderer now adopts the parser-owned DOM once after a parser-owner replacement (keeping the per-token fast path for normal ticks) and handles the source-space cursor at block boundaries, so live prose stays whole.

Gate (crown-jewel streaming surface — full gate)

• Codex: SAFE TO SHIP — no lost/duplicated/reordered/raw-Markdown text; normal per-token renders keep the fast path (O(n) adoption only once after parser-owner replacement, no perf regression); live-to-final, MEDIA tails, reduced motion, multi-block, Unicode/emoji/CJK, prefix-dedupe, classic-script collision all intact; base/head repro confirms base tears Ces de | ux… while head preserves the complete text; 227 focused tests + 18 subtests pass.
• Crown-jewel stream gate: GREEN across all modes (transparent_stream, compact_worklog, hide_all_activity) — proseReversals=0, nonProseReanims=0, no alternating (modeFlips=0). This is the definitive motion proof for a live-render fix.
• Full suite: 15103 passed (two pre-existing box-environment artifacts unrelated to this diff).

Credited via Co-authored-by in the release commit.

[greptile-apps]

Greptile Summary

This release fixes mid-word tearing in Transparent Stream by preserving parser ownership across live prose reconciliation and avoiding rendered-text/source-text cursor confusion.

• Exposes the existing rendered-prefix mute helper for transparent-stream reconciliation.
• Promotes the parser-owned live row after an owner replacement, preserving Markdown structure, fade-node identity, and pending parser tails.
• Appends cursor-based text inside the active trailing block rather than beside it.
• Adds browserless regression coverage for word boundaries, Markdown, pending tails, repeated growth, fade behavior, and row reconciliation.

Confidence Score: 5/5

The PR appears safe to merge; no actionable correctness, security, or repository-rule violations remain.

The changed reconciliation path preserves parser authority and stable node identity while the added tests exercise the reported tear, Markdown structure, pending parser state, animation behavior, and subsequent growth.

Important Files Changed

Filename	Overview
static/ui.js	Reconciles transparent live prose using parser-owned DOM, source-space cursors, block-aware appends, and rendered-prefix fade muting.
static/messages.js	Exposes the stateless rendered-prefix mute helper for reuse by the transparent-stream reconciler.
tests/test_live_prose_fade_cursor_source_space.py	Adds extensive browserless regression coverage for source/render cursor boundaries, Markdown ownership, pending tails, fade identity, and repeated growth.
tests/test_issue5367_transparent_live_row_reconcile.py	Updates the transparent-row reconciliation harness for the new block-aware append helper.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
    A[Streamed prose source] --> B[Incremental Markdown parser]
    B --> C[Parser-owned live row]
    C --> D{Existing keyed row uses same owner?}
    D -->|No, owner replaced| E[Adopt parser-owned row once]
    E --> F[Mute already-rendered prefix]
    D -->|Yes| G[Keep existing node identity]
    F --> G
    G --> H[Parser appends later source deltas]
    H --> I[Stable Transparent Stream prose]
    I --> J[Settled durable transcript replaces live view]

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