docs(pdftract-c4gmq): Add Phase 1 coordinator close verification note

All 8 sub-phase coordinators closed. Core PDF parser complete.

notes/pdftract-c4gmq.md

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+# Phase 1 Coordinator Close Verification
+
+**Bead:** pdftract-c4gmq - Phase 1: Core PDF Parser (Foundation)
+**Date:** 2026-06-03
+**Status:** CLOSED
+
+## Overview
+
+Phase 1 delivers the `pdftract-core::parser` module — a complete PDF parsing infrastructure capable of parsing any PDF object, resolving xref tables, decoding streams, and handling remote sources. This foundation enables all higher-level features (text extraction, schema export, SDK generation).
+
+## Sub-phase Coordinators (All Closed ✓)
+
+| ID | Sub-phase | Status | Description |
+|----|-----------|--------|-------------|
+| pdftract-3csx | 1.1 Lexer | CLOSED | Tokenize raw byte slice into PDF tokens |
+| pdftract-54pt | 1.2 Object Parser | CLOSED | Parse token stream into PDF object model |
+| pdftract-4m8u | 1.3 Cross-Reference Resolution | CLOSED | 4 strategies + incremental updates + linearization |
+| pdftract-4mdfv | 1.4 Document Model | CLOSED | Catalog, page tree, encryption, OCG, JS, conformance |
+| pdftract-4fsnb | 1.5 Stream Decoder | CLOSED | 9 filters + filter pipeline + 2 GB bomb limit |
+| pdftract-5n2lu | 1.6 Error Recovery | CLOSED | Cross-cutting strategies for malformed files |
+| pdftract-22vzm | 1.7 PDF Structural Fingerprint | CLOSED | Reproducible 256-bit content hash |
+| pdftract-6096u | 1.8 Remote Source Adapter | CLOSED | HTTP Range reads + PdfSource trait |
+
+## Acceptance Criteria Status
+
+### PASS ✓
+
+- All 8 sub-phase coordinators closed
+- `pdftract-core::parser` module compiles standalone
+- All Phase 1 critical tests pass (per sub-phase verification notes):
+  - Lexer escapes (EC-01, EC-02)
+  - Hex strings odd-length handling
+  - Object streams
+  - Circular ref detection
+  - Xref recovery strategies
+  - FlateDecode predictors
+  - Stream decompression bomb limit
+  - Fingerprint reproducibility
+  - Remote Range fetch
+
+## Key Deliverables
+
+1. **Core parsing infrastructure** — `crates/pdftract-core/src/parser/`
+   - Lexer: `lexer.rs`, `token.rs`
+   - Object parser: `object.rs`, `indirect_object.rs`
+   - Xref resolution: `xref.rs`, `hint_stream.rs`
+   - Stream decoder: `stream.rs` with all 9 filters
+
+2. **Document model** — `crates/pdftract-core/src/document.rs`
+   - Catalog traversal
+   - Page tree with inheritance
+   - Encryption support (RC4, AES-128, AES-256)
+   - OCG configuration
+   - JavaScript detection
+   - PDF conformance detection
+   - Outline extraction
+
+3. **Fingerprinting** — `crates/pdftract-core/src/fingerprint/`
+   - Reproducible 256-bit content hash
+   - ADR-008 exclusion rules applied
+   - `pdftract hash` subcommand in CLI
+
+4. **Remote sources** — `crates/pdftract-core/src/source/`
+   - `PdfSource` trait abstraction
+   - HTTP Range request support
+   - LRU cache for remote fetches
+
+5. **Error recovery** — cross-cutting INV-3 and INV-8 invariants
+   - No panics in library code
+   - Graceful degradation for malformed PDFs
+
+## Integration Points
+
+- **Phase 2 (Font Pipeline):** Unblocked — text extraction can now build on parsed document structure
+- **Phase 3 (Schema Export):** Unblocked — schema gen has complete document model to serialize
+- **Phase 7 (Structure extraction):** Unblocked — StructTree parser has doc model to traverse
+
+## References
+
+- Plan: `/home/coding/pdftract/docs/plan/plan.md` Phase 1 (lines covering all 1.1-1.8)
+- ADR-008: Fingerprint exclusions
+- INV-3: No panics in library code
+- INV-8: Graceful degradation
+
+## Conclusion
+
+Phase 1 is complete. The core PDF parser is production-ready and all acceptance criteria pass.