Decision Log (2026-02-27): Compliance-Aware Biometric Self-Recognition Content and NDC-Sharded Indexing, with CI Token Rotation

Context #

Recent work focuses on two themes that intersect in practical deployments of biometric and self-recognition features:

1) Compliance-aware biometric processing across jurisdictions (EU, Japan, and select US states), with emphasis on consent timing, prohibited practices, and safer architectural patterns.

2) Index organization improvements by restructuring knowledge content into Nippon Decimal Classification (NDC) shards, aiming to make retrieval and maintenance more scalable.

In this slot, the notable “decision-level” change visible in the working tree is a rotation/update of CI authentication tokens (a small delta with equal insertions and deletions), while the broader repository history around this date indicates substantial knowledge-pack evolution and NDC sharding work.

What changed #

1) CI authentication token rotation (decision)#

A small update was made to the CI authentication token configuration (3 insertions and 3 deletions). While the exact token values are not reproduced here, the practical outcome is:

CI access credentials were refreshed/rotated.
The change footprint is minimal and constrained to token configuration.

Why this matters: token rotation reduces the blast radius of credential exposure and aligns operational hygiene with the privacy/security posture expected for systems handling biometric data.

Although the working-tree diff for this slot is token-focused, the surrounding work in the same time window shows a clear direction:

2) Knowledge content expansion for self-recognition safety and compliance #

The knowledge base includes structured guidance spanning:

Jurisdiction gating before sensor activation (fail-closed when region is unknown; route to stricter standards).
Consent modality requirements (e.g., explicit opt-in; “written release” style flows in stricter US contexts; separation from general Terms acceptance).
Hard-blocked prohibited practices in the EU context (e.g., database-building via untargeted scraping; other high-risk biometric patterns).
Local-first patterns (e.g., “local match” approaches that avoid centralized biometric template storage where possible).
Decision UX guardrails such as avoiding binary accept/reject in high-stakes identity flows and using a ternary outcome with a “grey zone” for human intervention.

Why this matters: it shifts compliance from being a policy document into being an actionable design constraint: when capture can start, what must be shown to users, and what architectural patterns reduce risk.

3) NDC-sharded indexing to improve retrieval and maintenance #

The repository is reorganizing knowledge indices into NDC-aligned shards, including content aligned to areas such as:

Arts/Fine Arts (NDC 700) and painting-related subdivisions.
Art history (NDC 702).
Crafts subtopics (e.g., historical mirror craftsmanship under a dedicated craft sub-classification).
Japan history placement (NDC 210) as a structural classification choice.

Why this matters: sharding by NDC supports growth without turning retrieval into a monolithic, hard-to-maintain index. It also makes it easier to target domain-specific safety/compliance content (e.g., operational governance vs. environmental design controls) when composing responses.

Decisions captured #

1) Rotate CI auth tokens now

Decision: refresh CI credentials.
Rationale: reduces credential risk; supports ongoing changes where sensitive governance and compliance guidance is actively evolving.
Impact: operational continuity with improved security posture.

2) Keep compliance mechanics as first-class knowledge, not just schema

Decision (directional): represent cross-jurisdiction requirements as content that can drive product decisions (consent gates, prohibited features, safer patterns).
Impact: more consistent behavior across regions; fewer accidental non-compliant flows.

3) Continue NDC-based sharding to scale knowledge operations

Decision (directional): organize indices into NDC shards for maintainability and targeted retrieval.
Impact: better modularity and clearer boundaries between domains (law/compliance, operational governance, environmental design, etc.).

Outcome and next checks #

Security: confirm CI runs continue to authenticate successfully post-rotation, and ensure no token material is logged.
Compliance routing: validate that “jurisdiction unknown” resolves to strict defaults and blocks sensor initialization until prerequisites are met.
Knowledge retrieval: spot-check that NDC-sharded retrieval still surfaces key constraints (explicit consent, prohibited practices, local-match preference, and ternary decision UX) when prompted about biometric self-recognition.