feat(text): bound and extend justification (11.14 layer 3) - #69
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Word spaces expand uniformly up to the declared maximum ratio of their natural advance sum; the remaining deficit spills into inter-cluster letter gaps bounded per gap; residue reads as an under-full line. A declared minimum ratio makes spaces elastic both ways: the breaker lends the shrinkable fraction back while scanning, admitting the word that would otherwise just overflow through a new CLUSTER_SPACE flag, and positioning compresses those spaces to exactly the same bound. The last-line policy justifies final and hard-broken lines on request. Measurement mirrors every branch through positioned_fragment_advance. Proven red-green at distribution, breaker, and Three integration levels.
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# Conflicts: # docs/packages/benchmarks.md # docs/packages/glyph.md
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What
Layer 3 of the 11.14 typography tier: professional justification bounds.
Semantics
maxWordSpaceRatio× their natural advance sum; the remaining deficit spills into inter-cluster letter gaps bounded byletterSpaceExpansionper gap; any residue reads as an under-full line.minWordSpaceRatiomakes spaces elastic both ways. The line breaker lends the shrinkable fraction back while scanning — admitting the word that would otherwise just overflow, detected through a newCLUSTER_SPACEflag stamped at cluster build — and the positioning pass compresses those spaces to exactly the same bound, so break admission and paint always agree.lastLine: 'justify'extends justification to final and hard-broken lines.positioned_fragment_advance.Evidence
Red-green: distribution unit tests (cap spill into bounded gaps, shrink clamp at the declared minimum, last-line gates), a breaker admission test (rigid line breaks after the space; a 0.5 shrink fraction fits the whole run), and a Three integration segment — an unbounded justified last line fills its exact 300-unit box, while capped word growth plus a 0.5 letter-gap bound lands at natural-plus-gaps exactly. 180 Rust lib tests; full package check green.