fix(storage): preserve exploratory and qualified routes through replay

[DecisionNerd]

Construction emitted overlapping edge-ID ranges when multiple logical exploratory relationships shared one physical route. Replay rejected the otherwise valid fragments and also wrote exploratory/qualified input through a schema that lost route information.

Coalesce logical groups inside each existing bounded construction ID window, sort that window by edge ID, and preserve per-row relationship names. Replay retains the authenticated node/edge schema and qualified metadata, with variable relationship names included in memory charges. Duplicate and changed surrogate IDs still fail; no compatibility reader, encoding-policy change or full-graph sort is introduced.

Validation:

• Four public regressions cover retained-parent construction, property GFDR, real compaction, active snapshots, subsequent mutation, exact queries, reopen, export/full verification/clean import, and oversized coalesced-batch rejection before publication. Mixed exploratory/qualified coverage asserts a real delta run and exact schema/value preservation.
• 99 construction tests, 23 replay tests, 10 delta/compaction tests, and all five merged qualified-ownership public fixtures pass. Workspace Clippy, formatting, fast pre-push and gate-registry checks pass. Independent review found no blockers.
• Fixed regression ceilings: 1,024 batch rows, 4 KiB runs, merge fan-in two, 128 KiB Arrow batch, 4 MiB accounted live memory, 2 MiB temporary allocation peak, 1.5 MiB encode reads and 512 KiB encode writes per fixture phase. Exact observed counters and separate CPU/RSS/syscall evidence are in exploratory-replay-1218.json and the permanent-storage assessment. These construction counters are not whole-process resource ceilings.

Encoding policy remains #1213; broader topology-journal and constructed-parent composite topology authority remains #1221.

Closes #1218

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