High-level pipeline:

1. Writers: The extension instruments editor and file system events and appends PCM events to .coderoot/v1/files/<rel>.xform.jsonl (rotated by size).
2. Snapshot builder: snapshotBuilder.buildSnapshotFromJournal() consumes rotated journal files and materializes a per-file snapshot under .coderoot/v1/snapshots/<rel>.pcm.json (schema_version 1.1.8).
3. Index & manifest: indexManifest.writeManifest() writes a small repository-level manifest used by reporters and maintenance tasks.
4. Reporter: report.generateReport() locates assets/ci-reporter.mjs and executes generateReport(workspaceRoot) to produce JSON and Markdown outputs.

Data shapes and storage:

• Journals: newline-delimited JSONL under .coderoot/v1/files/*.xform.jsonl.
• Snapshots: JSON .pcm.json files under .coderoot/v1/snapshots/ containing spans with origins and summary sections (lines_by_origin, chars_by_origin, time_by_day, etc.).
• Refs: file binding and paths index under .coderoot/v1/refs/ (paths.json, bindings/*).

Maintenance & CI helpers:

• The extension includes helpers to seed or repair .github CI assets when coderoot.ci.maintenance.enabled is set.

Architecture (expanded)

Diagram (placeholder)

[Editor/FS events] -> [Journal writer (.coderoot/v1/files/*.jsonl)] -> [Snapshot builder (.coderoot/v1/snapshots/*.pcm.json)] -> [Reporter (assets/ci-reporter.mjs) -> JSON/MD]

Key boundaries

• The writer only stores hashes, counts, ranges, and provenance — no source text.
• The snapshot builder is responsible for synthesizing spans and computing per-file totals.
• Reporter consumes snapshots and index data to produce human-readable reports.

Out of scope

• This repo does not store or expose raw file contents in .coderoot.
• It does not attempt to auto-fix user code or modify source files (except optional maintenance scripts guarded by settings).

How to verify

1. Create a small test file, perform a few edits in VS Code, then run CodeRoot: Generate Report.
2. Inspect .coderoot/v1/snapshots/<file>.pcm.json and the generated Markdown for expected summaries.