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Changelog

All notable changes to polar-bear-biochip are documented here.

This project adheres to Semantic Versioning.

[Unreleased]

[0.2.0] - 2026-05-19

Added

  • rustfmt.toml - code-style rules (100 cols, Rust 2024 edition, crate-level imports)
  • .clippy.toml - Clippy config with MSRV 1.85.0 and complexity thresholds
  • .env.example - template for ANTHROPIC_API_KEY, model, cycle, and output tuning
  • CHANGELOG.md - this file
  • CONTRIBUTING.md - contribution guide with full dev workflow
  • FILE_STRUCTURE.md - annotated repository map
  • BUG-FIXES.md - root-cause analysis of resolved issues
  • docs/architecture.md - full system architecture with ASCII layer diagram and data flow
  • docs/bci_math.md - EEG signal processing math: band taxonomy, derived indices, sensor fusion formulas, activity classification, random walk model, ICA notes
  • examples/sensors_demo.rs - standalone sensor fusion table demo (no API key)
  • examples/provenance_demo.rs - ECDSA sign/verify/tamper demo (no API key)
  • examples/agent_demo.rs - Rig AI agent demo (--features ai-agent or demo fallback)
  • tests/sensor_tests.rs - 12 integration tests covering BCI, accelerometer, fusion
  • tests/provenance_tests.rs - 14 integration tests covering ECDSA sign/verify/tamper
  • src/lib.rs - crate root with architecture diagram and public module re-exports
  • src/error.rs - typed BiochipError hierarchy using thiserror
  • src/provenance/ecdsa_signer.rs - EcdsaVerifier standalone verifier struct; from_bytes() and from_hex() constructors; private_key_bytes() / verifying_key_hex()
  • .zed/tasks.json / debug.json - Zed IDE task and debug launch config

Changed

  • Cargo.toml - upgraded to Rust 2024 edition; added rust-version = "1.85.0" (MSRV); [package.metadata.docs.rs], [lints.rust], and [lints.clippy] tables; [features] with ai-agent optional flag gating rig-core ^0.37 + dotenvy; relaxed = exact pins to ^ semver-compatible; added thiserror ^2 and dotenvy ^0.15; added [dev-dependencies] (pretty_assertions, tokio-test); release profile: panic = "abort", strip = "debuginfo"
  • src/main.rs - restructured to run / verify subcommands (clap Subcommand); &PathBuf parameters replaced with &Path; AlertLevel::Display used instead of inline match; inline verification now uses standalone EcdsaVerifier
  • src/types.rs - added fmt::Display for BciReading, AccelerometerReading, FusedReading, and AlertLevel; added Eq derive on ActivityState and AlertLevel
  • src/sensors/bci.rs - added Default impl; 3 inline unit tests
  • src/sensors/accelerometer.rs - added Default impl; 4 inline unit tests
  • src/sensors/fusion.rs - added Default impl; 3 inline unit tests with boundary and monotonicity assertions
  • src/agent/biochip_agent.rs - restructured with ai-agent feature flag; rig-core used when feature is enabled; curl subprocess as fallback; added Default impl (demo = true); 3 inline unit tests
  • src/provenance/ecdsa_signer.rs - 7 inline unit tests; consistent with polar-bear-hft-crypto ECDSA module style
  • .github/workflows/ci.yml - added: MSRV check (1.85.0), cargo doc validation, ai-agent feature build and test steps, smoke-test job with verify command

Fixed

  • Fix 1 - src/main.rs: run_cycle parameter changed from &PathBuf to &Path. &PathBuf is a double-indirection anti-pattern; &Path is the idiomatic Rust type for borrowed path references (clippy ptr_arg lint).
  • Fix 2 - src/agent/biochip_agent.rs: removed #[cfg(not(feature = "demo_only"))] dead feature flag attribute that referenced a non-existent feature.
  • Fix 3 - src/main.rs: replaced inline AlertLevel match arms with result.alert_level.Display impl, eliminating the duplicated match pattern.

[0.1.0] - 2026-05-18

Initial release:

  • Multi-sensor BCI + accelerometer fusion pipeline
  • EEG band simulation (δ θ α β γ) with derived attention and meditation indices
  • Sensor fusion: cognitive_load, emotional_valence, arousal_level
  • rig-core–compatible BioChipAgent with demo mode (no API key required)
  • ECDSA secp256k1 signing of every InferenceResult → tamper-evident SignedOutput JSON
  • --verify CLI flag for offline signature verification
  • GitHub Actions CI: build + smoke test