# Pi Fovea Foundation

> Use when building a repo-mapping / code-graph context engine for coding agents: Chebyshev heat-diffusion relevance fields, foveated token-budget rendering with overflow artifacts, cross-language literal joins, declarative + statistically-discovered route anchors, honest incremental fact caches, turn-sync steering with a per-node surprise ledger, mutation-provenance journals attributing drift to sessions, progressive nested-repo disclosure, and hybrid grep routing.

- Skill: `ryan-brosas/pi-fovea-foundation` (Agent Skill, multi-file: 38 files)
- Install (CLI): `npx skillmds@latest add ryan-brosas/pi-fovea-foundation`
- Raw SKILL.md: https://api.skillmd.com/api/skills/ryan-brosas/pi-fovea-foundation/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- Author: ryan-brosas (https://skillmd.com/u/ryan-brosas)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/ryan-brosas/pi-fovea-foundation

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# Pi-Fovea: Foveated Repo-Mapping Extension (Heat-Diffusion Context Engine)

## Foundation contract

This is a cold, source-specific foundation, not an operational procedure. It is
historical, revision-pinned evidence rather than timeless guidance. Current
project source, tests, requirements, and runtime behavior outrank this
projection and decide what ships.

## Provenance and revision

- Source record: `pi-fovea`; portable upstream identity, license, coverage caveats, and retrieval history are preserved in the index.
- Recorded revision: `main@5bd4e6f5c56190fb174245266464607b11f7a337`.
- Full provenance, coverage caveats, boundaries, and preserved evidence:
  `references/index.md`.

## Topic map

- Representative topics: Heat kernel; CSR operator; Renderer; Literal joins;
  Sync gate; Co-change; Anchor pack; Discovery.
- Scope and retrieval questions: `references/index.md#use-this-for`.
- Complete capsule chooser: `references/index.md#load-the-matching-source-dump`.
- Detailed grouped map: `references/index.md#capsule-map`.
- Source limitations and portability boundaries: `references/index.md#boundaries`.

## Retrieval

Open the index, choose one capsule matching the active question, and load only
that capsule. Revalidate its cited source and revision before relying on it. Do
not bulk-load the inventory, treat historical claims as current truth, or apply
this foundation as a procedure.