feat(io): export deterministic graph data subsets with referential closure

[DecisionNerd]

Closes #786

Summary

• add portable-v2 graph-data-subset preview/plan APIs over pinned generations
• support induced-edges and referential closure with property redaction
• emit verified expanded/bundle packages with content-free selection.graph_subset receipts

Test plan

• cargo test -p graphforge-storage --lib project_portable_v2_subset
• cargo clippy -p graphforge-storage --lib -- -D warnings
• CI Gate green on exact head

Made with Cursor

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📥 Commits

Reviewing files that changed from the base of the PR and between a000745 and 71d9e8a.

⛔ Files ignored due to path filters (1)

• docs/book/architecture/portable-project-v2.md is excluded by !**/*.md, !**/docs/**

📒 Files selected for processing (6)

• crates/graphforge-api/src/belief_projection.rs
• crates/graphforge-storage/src/graph_projection.rs
• crates/graphforge-storage/src/lib.rs
• crates/graphforge-storage/src/project_portable_v2_export.rs
• crates/graphforge-storage/src/project_portable_v2_selection.rs
• crates/graphforge-storage/src/project_portable_v2_subset.rs

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[codspeed]

Merging this PR will regress 1 benchmark

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 2 improved benchmarks
❌ 1 regressed benchmark
✅ 61 untouched benchmarks

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	transaction_classification[1]	339.6 ns	404.8 ns	-16.12%
⚡	WallTime	durable_open	27.4 µs	19.1 µs	+43.7%
⚡	WallTime	spill_compaction	4.3 ms	3.9 ms	+10.29%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing feat/786-graph-data-subset-export (71d9e8a) with main (91544c3)¹}

Footnotes

1. No successful run was found on main (a000745) during the generation of this report, so 91544c3 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩