perf(storage): pack current construction records

[DecisionNerd]

Construction shaping still writes and repeatedly merges padding in identity and endpoint streams. Pack the exact current format to 26-byte identities, 33-byte endpoints and 25-byte resolved endpoints, preserving complete UUIDs, retained markers, roles and 64-bit surrogates. The permanent UUID index remains 25 bytes.

Construction format 10 rejects older authority and omitted current-format counters instead of retaining compatibility readers or backfills. Current canonical parent/publication fixtures preserve lifecycle, corruption, recovery, retry and accounting checks; deterministic golden tests exercise full-width identities/surrogates and malformed/truncated records.

The frozen release comparison reduces shaping peak allocation 17.26–17.81%, logical shape reads 15.80–16.52%, and merge writes 20.36–20.59% beyond #1268. Three candidate CPU observations are 4.43/4.76/4.63 seconds; maximum observed RSS is 50,468 KiB, up 492 KiB, within the preselected budget. Process input/output blocks also fall. The integrated report links full observations and measurement limitations.

Validation: frozen storage suite 1,105 passed, one known local #1192 filesystem failure, two existing ignored; public lifecycle 5/5; publishing-path contracts 4/4; workspace Clippy, formatting, fast checks and gate registry passed. Current golden tests preserve exact full-width UUID/surrogate bytes and refuse every truncated record tail, invalid kind/marker/role and unsupported checkpoint. Failed/superseded authoring and measurement-setup evidence is retained. Final integrated host evidence follows the merged implementation on the existing S18/S19/S20/S22 ladder with unchanged reserve; no S24/S26 run is included.

Closes #1274

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