Traverse recursive WARP graphs with cycle-safe bounded receipts

[flyingrobots]

Plan: https://github.com/git-stunts/git-warp/blob/plan/streaming-recursive-materialization/docs/plans/streaming-indexed-recursive-warp.md
Design PR: #813

Outcome

Extend indexed traversal across graph-valued attachments without call-stack recursion, global ordinal assumptions, eager child materialization, or infinite expansion.

Required work

• Use an explicit async work queue with backpressure and cancellation.
• Apply each child graph local Roaring selection and address roots.
• Track visited identity by graph identity, retained root, and coordinate.
• Distinguish first expansion, shared reference, direct/indirect cycle, unresolved locator, redaction, and budget exhaustion.
• Support depth, graph, node, edge, result, byte, time, and concurrency budgets.
• Preserve occurrence paths while avoiding repeated basis expansion.
• Emit continuation cursors and transitive receipts.

Acceptance

• Direct and indirect cycles terminate deterministically.
• Shared child graphs are expanded once while all reference paths remain observable.
• Slow consumers do not cause unbounded queue growth.
• Every opened child basis and live-locator resolution appears in the receipt.
• Limit exhaustion reports incomplete posture and a usable cursor.
• No traversal path constructs a complete parent or child graph.

[coderabbitai]

🔗 Related PRs

#639 - Guard fresh live observer materialization [merged]
#755 - fix: retain bounded materialization roots [merged]
#762 - Read retained properties through git-cas 6.5 [merged]
#771 - feat: resume retained materialization predecessors [merged]
#813 - Define streaming indexed recursive WARP architecture [open]

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