feat(distributed-storage): add ChallengeStore, SQL-like queries, and comprehensive tests (#3)

* test: add comprehensive SudoAction tests

Add tests for:
- Challenge management (AddChallenge, UpdateChallenge, RemoveChallenge)
- Emergency controls (EmergencyPause, Resume)
- Signature verification for sudo operations
- ChallengeContainerConfig validation
- All SudoAction variants signing/serialization

* feat(distributed-storage): add ChallengeStore for per-challenge namespaced storage

- Create challenge_store.rs with ChallengeStore struct wrapping DistributedStore
- Implement namespace isolation via challenge_id prefixing
- Add merkle proof generation for all store/retrieve operations
- Include MerkleProof, MerkleNode types for verifiable data inclusion
- Add ChallengeStorage async trait for abstraction
- Add ChallengeStoreRegistry for managing multiple challenge stores
- Implement state root computation via compute_state_root()
- Add comprehensive tests for all operations

* feat(bittensor-integration): add MockMetagraph for testing

- Add mock.rs module with MockMetagraphBuilder and MockNeuronBuilder
- Provide helpers: hotkey_from_seed, create_validators, create_test_metagraph
- Add test-utils feature for exposing mocks to other crates
- Add comprehensive tests for mock functionality and validator sync logic

* feat(distributed-storage): add SQL-like query capabilities with block indexing

- Add query.rs with QueryBuilder, QueryFilter, QueryResult, QueryCursor types
- Add block-indexed secondary storage for efficient range queries
- Add DistributedStore trait methods: list_before_block, list_after_block,
  list_range, count_by_namespace, query, put_with_block
- Implement all query methods for LocalStorage and DhtStorage
- Add comprehensive tests for all new functionality
- Support pagination via cursors and fluent query building

* test(challenge-sdk): add comprehensive ServerChallenge async tests

* test: add comprehensive blockchain state verification tests

Implements 28 tests for:
- Bittensor block linking (5 tests)
- Merkle proof computation and verification (8 tests)
- State hash integrity and verification (7 tests)
- Integration tests including full lifecycle (8 tests)

Author: echobt

Cargo.lock

@@ -4,6 +4,11 @@ version.workspace = true
 edition.workspace = true
 description = "Bittensor integration for Platform Chain validators"
 
+[features]
+default = []
+# Enable test utilities (mock types) for integration tests in other crates
+test-utils = []
+
 [dependencies]
 platform-core = { path = "../core" }
 platform-challenge-sdk = { path = "../challenge-sdk" }
@@ -30,3 +35,6 @@ parking_lot = { workspace = true }
 chrono = { workspace = true }
 futures = { workspace = true }
 reqwest = { version = "0.11", features = ["json"] }
+
+# For mock module (hash-based hotkey generation)
+sha2 = { workspace = true }

crates/bittensor-integration/Cargo.toml

@@ -20,6 +20,10 @@ mod config;
 mod validator_sync;
 mod weights;
 
+// Mock module for testing - available in tests and to other crates for integration tests
+#[cfg(any(test, feature = "test-utils"))]
+pub mod mock;
+
 #[cfg(test)]
 mod tests;