test(direct-room): compare anchor reconciliation across pages

[0thernet]

Change

• Add a 64-case Hegel regression for bounded anchor-reconciliation page partitions after a retained author chain learns an earlier owner seal.
• Verify fresh admission remains fenced, signed interior forks and wrong terminals reject page-atomically, exact retries preserve the retained head, and only completed reconciliation permits a current-policy append.
• Record the agent-decided lane and residual limits in the promotion-gates plan; no production semantics or bounds change.

Checks (Rust 1.98.1, locked offline Cargo cache)

• Focused anchor_reconciliation_page_partitions_match_single_frame_replay: 1/1
• cargo test --locked -p vhalla-direct-room: 23/23 protocol tests and doc tests
• Strict package Clippy (--all-targets --all-features -- -D warnings), workspace fmt check, and git diff --cached --check: passed

Local protocol evidence only; no physical-crash, independent-machine, browser/WASM, live-network or release qualification. Exact-head Required and post-merge main remain integration gates.

[vercel]

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Project	Deployment	Actions	Updated
valhalla	Ready	Preview	Oct 11, 2026 2:08pm UTC