[codex] remove duplicated pnpm root config

[juliusmarminge]

What changed

• Removed pnpm workspace configuration duplicated in the root package.json (workspaces, overrides, and patchedDependencies).
• Added @t3tools/shared/schemaYaml, a single-file SchemaGetter/SchemaTransformation-based YAML helper with parse/stringify getters and schema decoding support.
• Updated all repo-local YAML parsing of pnpm-workspace.yaml to use the shared schema helper.
• Added a workspace override for yaml: "catalog:" so Effect and the rest of the workspace resolve the same yaml version.
• Adjusted sync tests and a stale desktop build diagnostic message to point at the workspace YAML config.

Why

The pnpm workspace config now lives in pnpm-workspace.yaml, so keeping duplicate root package.json fields risks drift. The sync/build scripts also needed to stop depending on local ad hoc YAML parsing and use a reusable schema-based parser.

Validation

• vp test run packages/shared/src/schemaYaml.test.ts scripts/sync-reference-repos.test.ts
• vp check (passes with existing lint warnings)
• vp run typecheck
• corepack pnpm install
• corepack pnpm list yaml -r --depth 20 reports only yaml 2.9.0
• find node_modules/.pnpm -maxdepth 1 -type d -name 'yaml@*' reports only yaml@2.9.0

Note

Remove duplicated pnpm root config and add YAML schema decoding support

• Removes workspaces, catalog, overrides, and patchedDependencies from the root package.json, consolidating these into pnpm-workspace.yaml.
• Adds a new @t3tools/shared/schemaYaml module (schemaYaml.ts) with fromYaml and fromYamlString schema constructors that decode/encode YAML strings with structured error mapping.
• Updates readWorkspaceConfig in both apps/server/scripts/cli.ts and scripts/build-desktop-artifact.ts to validate parsed YAML against a Schema.Struct instead of casting the raw parse result.
• Updates effect-smol in scripts/lib/reference-repos.ts to read its version from pnpm-workspace.yaml via the new YAML decoder rather than from a package.json.

^{Macroscope summarized e58544b.}

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[github-actions]

🚀 Expo continuous deployment is ready!

• Project → t3-code
• Platforms → android, ios
• Scheme → t3code-preview

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Build Details	Build Permalink Details Distribution: INTERNAL Build profile: preview:dev Runtime version: 251694208975e82c56bd5289d014d27db782d79c App version: 0.1.0 Git commit: fff460b4abc01f29f5b2cdb5bf25d955066816ee	Build Permalink Details Distribution: INTERNAL Build profile: preview:dev Runtime version: 88f9ec34318a3522ac20299028ec60ca0080a665 App version: 0.1.0 Git commit: fff460b4abc01f29f5b2cdb5bf25d955066816ee
Update Details	Update Permalink Details Branch: pr-2939 Runtime version: 251694208975e82c56bd5289d014d27db782d79c Git commit: 7ece907465c30a006e7603d72acae3f2ec1a9f64	Update Permalink Details Branch: pr-2939 Runtime version: 88f9ec34318a3522ac20299028ec60ca0080a665 Git commit: 7ece907465c30a006e7603d72acae3f2ec1a9f64
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[macroscopeapp]

Approvability

Verdict: Approved

This PR removes duplicated pnpm workspace configuration from package.json and consolidates it in pnpm-workspace.yaml, while adding a shared YAML parsing utility for build scripts. Changes are limited to internal tooling and include appropriate test coverage.

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