Add the mandatory block kind and its params contract

[AStaroverov]

Scaffold kind/ and let structure refresh wire it: the facade gains a direct kind devDep, the model a kind dependency. BlockParams is inputAnchor plus annotationSpecUi, both optional — a block created from the UI has neither, and export has to describe that state rather than fail on it.

Both fields are stored exactly as they arrive, so init and templateParams are identities. inputAnchor stays the ColumnUniversalId the block already holds; its block id, and every block id inside the annotation filters' column ids, is rewritten by the SDK codec on export and resolved again on apply.

parseTemplateParams checks the envelope and the anchor and stops at the shape of a filter step: a step the user has not finished filling in is ordinary live state, and the projection hands live state back untouched, so anything stricter would make a block export a file its own kind refuses to apply.

Greptile Summary

The PR introduces a mandatory block kind and connects its initialization contract to model initialization and template export, while updating SDK dependencies and column APIs.

• BlockParams — the block initialization contract containing optional inputAnchor and annotationSpecUi; newly defined by the kind package.
• parseInitializationParams — validates the initialization envelope, column anchor, annotation metadata, and step-level shape; now rejects non-string defaultValue values.
• kind — the block identity and parameter contract produced by defineBlockKind; now supplied to both DataModelBuilder and BlockModelV3.
• annotationSpecUi — editable annotation configuration stored in block state; now accepted during initialization and returned during template export.
• templateParams — the template projection for reconstructing a block; now exports inputAnchor and annotationSpecUi.
• splitByAxes — the current column-splitting API; replaces expandByPartition for overlap and sample tables.
• hasReachableData and getData() — the current reachability guard and data accessor; replace getLeafColumnData.
• Package and workflow configuration now includes the kind workspace, updated Platforma SDK versions, clean-install-safe dependency resolution, and mandatory block-package changeset enforcement.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains; the parser now rejects invalid non-string default values, and the unavailable local dependency overrides have been removed without leaving external file references.

Important Files Changed

Filename	Overview
kind/src/index.ts	Defines the block kind, initialization parameter types, and runtime validation; the previously reported defaultValue contract gap is fixed.
model/src/dataModel.ts	Registers the kind with the data model and initializes state from optional template parameters.
model/src/index.ts	Registers the kind with the block model, adds template parameter projection, and migrates column operations to current SDK APIs.
model/src/types.ts	Re-exports annotation parameter types from the kind package so persisted state and initialization share one contract.
package.json	Removes external local-tarball overrides, resolving the previously reported standalone-install failure.
pnpm-workspace.yaml	Adds the kind workspace and updates the shared dependency catalog required by the new contract.
.github/workflows/build.yaml	Requires pull requests to include a changeset bump for the published block package.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  T[Template parameters] --> P[parseInitializationParams]
  P --> K[Block kind contract]
  K --> I[Data model init]
  I --> S[Live block state]
  S --> E[templateParams projection]
  E --> T

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