D-WAL-6: wire the version clock into LanceCycleWriter

[AdaWorldAPI]

VersionClock (#1562) had no writer. LanceCycleWriter now keeps one, following the clock's own contract.

What changes

• Seeding on open and on bootstrap. The clock starts at the store's current version, with the row count taken from the physical row counts of the manifest the handle already holds. No extra reads. Versions before that point return None.
• Recording after every commit. commit_cycle now wraps the old body (moved unchanged to commit_cycle_inner) and records the handle's version after every outcome: Committed, Reconciled, or an error after a reopen.
• Deleted rows keep their positions. The clock counts physical rows, so a deleted row stays inside its range and the reader masks it.
• Rows going back start a new clock. If the row count drops at a newer version, which a reordering rewrite can cause, a fresh clock starts at that version. A fragment without a physical row count leaves the writer with no clock.

Tests (red first, then green)

1. On a store this writer created, the clock equals storage at every version.
2. A reopened writer starts its clock at the head and returns None before it; the next commit is recorded correctly.
3. After a delete, the clock counts positions, not live rows, and the next append's range matches storage.
4. A reconciled append (the acknowledgement was lost) keeps the clock equal to storage.

Disable runs, each red: no sync after commit (4 of 4 tests fail), counting live rows instead of positions (test 3 fails), starting a new clock on every sync (test 1 fails).

cargo test -p lance-graph --lib cycle_sink passes 28 of 28, and cargo clippy -p lance-graph --lib --tests -D warnings is clean.

Open

• No reader uses the clock yet.

🤖 Generated with Claude Code

https://claude.ai/code/session_011BMJnDBAfzcuQh5HeT39Rh

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Generated by Claude Code

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Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-15T21:20:31.746202Z	6ced788	Draft marked ready

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