chore(main): release 0.2.2

[github-actions]

🤖 I have created a release beep boop

0.2.2 (2026-02-01)

Features

• pass EXTRA_* env vars to challenge containers (509178d)
• validator: add periodic challenge refresh + apply emission_weight (3cfbd77)
• validator: add periodic metagraph refresh every 5 minutes (22c9f57)
• validator: convert hotkey weights to UIDs using metagraph (630990c)
• validator: submit weights on startup if missed (f8771fe)

Bug Fixes

• Add SSE streaming support to bridge proxy (b223979)
• auto-reconnect Bittensor on 'restart required' with exponential backoff (b24aac5)
• bridge: route root-level endpoints without /api/v1 prefix (b5102e5)
• ci: separate coverage job to prevent cancellation (8cd7b3e)
• docker: use external network to avoid compose label conflict (8056f50)
• merge weights by mechanism_id before submitting (a6af2d5)
• Preserve original headers in SSE streaming passthrough (0cd2759)
• validator-node timeout and skip unhealthy challenges (26da2c8)
• validator: add missing emission to burn to preserve weight proportions (4a41d76)
• validator: auto-reconnect BlockSync after Bittensor connection loss (57a1d35)
• validator: correct weight merging for hotkeys without UIDs (dcc363f)
• validator: max-upscale weights to match Python SDK behavior (63af164)
• validator: retry set_mechanism_weights up to 3 times on failure (10332c3)
• validator: send 100% burn when challenge returns no/empty/unresolved weights (b180427)
• validator: unresolved hotkey weights go to burn instead of being lost (969bf87)

Performance Improvements

• reuse HTTP client in bridge proxy to reduce CPU overhead (5077c75)

Code Refactoring

• remove P2P consensus and networking code (7678293)

Documentation

• add docker network create step to validator guide (52d29f8)

Miscellaneous

• fix configuration table in the readme (9f3fa85)
• fix configuration table in the readme (160541e)
• nitpicks by coderabbitai (3e21331)
• Remove unused crates and files (371bec7)
• Remove unused crates and files (88b3468)
• remove unused method receive_write_proposal (2eabda6)

Tests

• add comprehensive unit tests to platform-server (+289 tests) (cd15c6f)
• add missing tests for command.rs (a7d5f44)
• add missing tests for config.rs (7c94ac3)
• cover missing paths for health.rs (0f777ef)
• platform-storage: add comprehensive test coverage for storage modules (90940ce)
• subnet-manager: add comprehensive units tests (59beb07)

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