docs: position pg-sprite by problem class — online executor, peers not competitors - #54
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Name the two problem classes — convergence planners (pg-schema-diff, pg-delta) vs online executors (pgroll, pg-osc, pg-sprite) — so comparisons land on execution grounds: peers under different design criteria, with planners as potential complements at the declarative front door, not alternatives.
Replace the "judge it on execution grounds" framing: pg-sprite exists to satisfy the design criteria in design-principles.md; pgroll and pg-osc are peers built to different criteria.
The peers in the comparison list are linked; link pg-sprite the same way so the three executors read in parallel.
Kiran01bm
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aparajon
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Positions pg-sprite by problem class in vision.md's ecosystem section so comparisons with other tools land on the right grounds.
Why
Readers keep comparing pg-sprite against convergence planners (pg-schema-diff, pg-delta) on object-model breadth — a category error: those tools produce a DDL artifact, they don't manage a live operation. The doc set never stated the split explicitly, so vision.md now does.
What
Docs-only change; no code or behavior affected.