Add repository scope profile

SCOPE.md

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+# SCOPE
+
+> This file helps humans and agents understand when this repository is useful,
+> what it owns, and where its boundaries stop.
+
+---
+
+## One-liner
+
+markitect-filter provides concrete source-format adapters that convert EPUB3 and
+digitally readable PDF inputs into normalized Markitect Markdown documents.
+
+---
+
+## Core Idea
+
+This repo keeps source extraction outside `markitect-tool` while implementing
+the Markitect source adapter contract. It turns selected external document
+formats into deterministic, normalized read-side artifacts that the Markitect
+core can consume without knowing each format's package or file structure.
+
+---
+
+## In Scope
+
+- EPUB3 read adapter descriptor and package-to-Markitect normalization.
+- PDF read adapter descriptor for local, digitally readable PDF inputs.
+- Source attachment metadata for EPUB package resources, PDF embedded files,
+  and PDF image-resource signals.
+- Tests, examples, and docs for adapter contract compatibility.
+- Entry points under `markitect_tool.source_adapters`.
+
+---
+
+## Out of Scope
+
+- Markitect core document, contract, render, memory, or workflow engines.
+- OCR, scanned-document recognition, and layout-perfect PDF reconstruction.
+- Export or rendering behavior.
+- Remote ingestion services, queues, storage, or production hosting.
+- Owning the passive render asset manifest contract beyond read-side handoff
+  metadata.
+
+---
+
+## Relevant When
+
+- You need Markitect to ingest EPUB3 or digitally readable PDF sources.
+- You are testing source adapter descriptors against `markitect-tool`.
+- You need attachment metadata from source documents for downstream render
+  manifest planning.
+- You are maintaining EPUB3/PDF normalization fixtures and examples.
+
+---
+
+## Not Relevant When
+
+- The needed behavior belongs in the source adapter contract itself.
+- The work is Quarkdown rendering or export production.
+- The input is scanned or image-only PDF requiring OCR.
+- The task is general Markdown transformation after normalization.
+
+---
+
+## Current State
+
+- Status: active.
+- Implementation: Python 3.12 package with EPUB3, PDF, attachment metadata,
+  tests, examples, and docs.
+- Stability: adapter slices are deterministic and test-covered.
+- Integration: registered in the Custodian State Hub as `markitect-filter`.
+
+---
+
+## How It Fits
+
+- Upstream contract: `markitect-tool` owns the source adapter interfaces and
+  normalized document model.
+- Downstream consumers: Markitect workflows load this package through source
+  adapter entry points.
+- Adjacent repo: `markitect-quarkdown` consumes Markitect render/export
+  contracts on the output side.
+
+---
+
+## Terminology
+
+- Preferred terms: source adapter, normalized Markdown document, attachment
+  metadata, EPUB3 package, digitally readable PDF.
+- Also known as: Markitect filter adapters.
+- Potentially confusing terms: "filter" means source normalization here, not
+  policy filtering or search result filtering.
+
+---
+
+## Related / Overlapping
+
+- `markitect-tool` - owns core contracts and normalized document APIs.
+- `markitect-quarkdown` - owns concrete rendering/export through Quarkdown.
+- `the-custodian` - State Hub registration, workplan tracking, and consistency
+  sync.
+
+---
+
+## Getting Oriented
+
+- Start with: `README.md`, `docs/pdf-adapter.md`, and
+  `docs/source-attachment-metadata.md`.
+- Key directories: `src/markitect_filter/`, `tests/`, `examples/`, and
+  `workplans/`.
+- Entry points: `markitect_filter.adapters:epub3_adapter_descriptor` and
+  `markitect_filter.adapters:pdf_adapter_descriptor`.
+
+---
+
+## Provided Capabilities
+
+```capability
+type: source_adapter
+title: source.epub3
+description: Convert EPUB3 packages into normalized Markitect Markdown documents with package resource attachment metadata.
+keywords: [epub3, source-adapter, markdown, attachments]
+```
+
+```capability
+type: source_adapter
+title: source.pdf
+description: Convert local digitally readable PDFs into normalized Markitect Markdown documents with embedded-file and image-resource signals.
+keywords: [pdf, source-adapter, markdown, attachments]
+```
+
+---
+
+## Notes
+
+Run tests with `PYTHONPATH=src:/home/worsch/markitect-tool/src python3 -m
+pytest` from this checkout.