docs(ts): document the solution-root TypeScript project layout
New authoritative section docs/development.md#typescript-project-layout (five files, three roles, the program-vs-resolution principle and its two disciplines), two repo conventions in AGENTS.md, package tsconfig shape in packages/AGENTS.md, cookbook touch-lists updated for the two aggregates, test source-plane rule in docs/testing.md. Decision record: new Agent Note 2026-07-22-tsconfig-solution-root-two-aggregates; ts-build-config note updated in place (tsc-first pipeline unchanged); the two GUI RFCs now name tsconfig.host.json. All bilingual pairs re-recorded. Doc budget ceilings raised: AGENTS.md 1680, docs/testing.md 1020, packages/AGENTS.md 660 (two new one-line conventions and one new section on already-near-ceiling docs). Mission spec for the code-side migration: missions/tsconfig-single-graph-migration.md.
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@@ -38,8 +38,7 @@ Local relative imports/exports in vendored TypeScript source use explicit `.ts`
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| File | Change |
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|---|---|
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| `tsconfig.base.json` | add `"<npm-name>": ["./vendor/<dir>/src"]` to `paths` |
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| `tsconfig.json` | add `{ "path": "./vendor/<dir>" }` to `references` |
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| `tsconfig.build.json` | add `{ "path": "./vendor/<dir>" }` to `references` (before the `packages/*` entries) |
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| `tsconfig.host.json` | add `{ "path": "./vendor/<dir>" }` to `references` (before the `packages/*` entries; vendored code enters the graph through the host aggregate only) |
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| `vendor/README.md` | add a manifest table row (dir, npm name, version, upstream repo, commit SHA) and log any local modifications |
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| `scripts/publint-all.ts` | only if the vendored package is itself published from here (vendored deps normally are not — skip) |
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@@ -57,4 +56,4 @@ pnpm run typecheck
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pnpm run build && pnpm run test && pnpm run constraints
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```
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The source `paths` map is shared by build and root typecheck configs. The important isolation boundary is the project-reference graph: vendored source must be referenced through its own `vendor/<dir>/tsconfig.json`, not pulled into a root strict program.
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The source `paths` map lives once in `tsconfig.base.json` and serves every graph. The important isolation boundary is the project-reference graph: vendored source must be referenced through its own `vendor/<dir>/tsconfig.json`, not pulled into an aggregate's strict program ([layout](../development.md#typescript-project-layout)).
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