Features/correctness iteration

[UnityZappy]

Add golden validation and MemoryProfiler summary-page metrics.
Extend the snapshot exporter to compute and validate the Unity Memory Profiler "Summary" page numbers, and add supporting snapshot decoding, reporting, and batch tooling.

Summary metrics

• SummaryMetricsCalculator replicates EntriesMemoryMap (build/sort/post-process), GetPointType classification, and the AllMemory/Managed summary builder heuristics (legacy untracked fallback, graphics estimation, map-resolved VM-root reassignment).
• Export the Allocated Memory Distribution and Managed Heap Utilization breakdowns plus totals to a new summary_metrics table (DuckDB + SQLite).

Golden validation

• GoldenValidationRunner compares an exported DB against golden JSON (AssetBundle/SerializedFile/Remapper plus all summary categories), with committed/resident tolerances and a CLI validate command.
• Add the com.unity.memory-snapshot-data-tools Unity package, whose editor GoldenValueExtractor reads golden values straight from the Memory Profiler's own summary model builders.
• scripts/validate-golden.sh exports + validates in one step for CI.

Snapshot decoding fixes/additions

• Correct ProfileTarget_Info/_MemoryStats entry IDs (59/60, not 64/65) so TargetMemoryStats decodes; read SystemMemoryRegions_Type as ushort so Mapped/Device regions classify correctly.
• Decode managed heap section types, target memory stats, and per-type static field bytes; crawl static-field roots so statically reachable managed objects are discovered.
• Add SnapMetadataReader, SnapProfileTargetInfoParser, CaptureMetadata, ResidentMemoryCalculator, and MemoryMapResidentAggregator.

Reports, batch export, CLI, docs

• Multi-snapshot HTML report (builder, renderer, session grouping).
• BatchExportRunner/ExportRunner and batch-export CLI command.
• Document the .snap binary format (docs/snap-file-format.md); update the report skill and mkdocs nav.
• Tests for golden validation, summary metrics, resident memory, batch export, and session grouping.

Add summary CLI command for high-level memory reports
Print a MemoryProfiler-style memory summary for a snapshot or an exported database directly to the console, without generating a database.

• summary <input> accepts a .snap snapshot or a .duckdb/.db database. Snapshots run the same extraction pipeline as export/validate (SnapshotBridge) and read the computed SummaryMetrics; databases read the snapshot_info and summary_metrics tables via the golden-validation queries.
• SummaryReportFormatter renders capture metadata, Total Allocated/Resident, and the Allocated Memory Distribution + Managed Heap Utilization breakdowns as aligned text ("—" where resident size is unavailable).
• Always reports progress and total duration (not just under --verbose); snapshot decode progress is surfaced via a forcing progress wrapper.
• When a database predates summary_metrics, print a runnable re-export example using the snapshot path recorded in snapshot_info.
• Tests for the formatter (metadata/totals/breakdowns, unavailable resident, missing-summary notice).

Also fill in docs/intro.md with the project description and support contact.

Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com