feat: consistent input validation with tool execution errors

[bobby-smedley]

🎯 What does this PR do?

Core change - SDK upgrade (enables schema-level validation → isError:true):

• go.mod/go.sum: SDK v1.1.0 → v1.5.0
• pkg/chip/server_test.go: two tests proving missing-required / wrong-type return isError: true

New validation helpers:

• pkg/tools/validation/uuid.go: UUID, UUIDOptional, UUIDs + tests

UUID validation added to 10 tool handlers:

• add_business_term, add_data_classification_match, create_asset, get_asset_details, get_business_term_data, get_column_semantics, get_measure_data, get_table_semantics, pull_data_contract_manifest, remove_data_classification_match,
  search_asset_keyword, search_lineage_entities

All bad-UUID paths now return Go error → SDK wraps as isError: true.

Tests updated to use valid UUID-format placeholders and the new error contract.

✅ Checklist

• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation (if needed).
• My commit messages follow the Conventional Commits standard.