docs(roadmap): add the post-2.0 engineering roadmap#324
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Capture the engineering work deferred past the 2.0 line in a forward-looking roadmap: decomposing the layout hot files (LayoutCompiler / TextFlowSupport), retiring the internal Entity model, a fail-on-unconverged layout policy, streaming / bounded-memory rendering, ArchUnit boundary guards, cross-module coverage aggregation, and post-GA per-module japicmp baselines. Link it from the docs index and relabel the shipped v1.6 roadmap.
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Why
The engineering work deliberately deferred past the 2.0 line (internal refactors, scale, tooling) was only tracked privately. This puts it in a committed, forward-looking roadmap so it isn't lost, and refreshes the docs index (which still called the shipped v1.6 roadmap "current").
What
docs/roadmaps/post-2.0-engineering.md(new) — deferred engineering items, each with a status:LayoutCompiler(~1690 LOC) andTextFlowSupport(~1900 LOC) along their seams (pagination / row / stack / decoration), output unchanged.Entity/EntityManagermodel (the live coordinate/geometry/guides are still built on it; a real engine refactor + removing thegraph-compose-testinglegacy snapshot overloads).FAIL_ON_UNCONVERGEDlayout policy flag.report-aggregatedoesn't traverse test-scope deps).docs/README.md— link the new roadmap at the top of "Roadmaps & migrations"; relabelv1.6-roadmap.mdas shipped.No public-API or code changes; describes intent, not internal planning artifacts.
Tests
Docs-only.
CanonicalSurfaceGuardTest(scansdocs/**for retired legacy tokens): 8 tests, 0 failures. New roadmap link resolves; no broken references.