fix(storage): compact authenticated construction detail records

[DecisionNerd]

Private construction detail runs reserve 255 bytes for each label or route, even for short names. Store the exact UTF-8 name bytes in new version-7 sessions while preserving every UUID and continuing genuine version-6 sessions with their original fixed codec. Authentication, merge, recovery, and canonical encoding use the session-bound codec and count actual wire bytes and decoded rows. A genuine version-6 crash before initial checkpoint installation recovers its codec from a complete, matching initial temporary; unknown, conflicting, or changed authority is rejected without promoting temporary contents.

An equal-input 1,024-node/1,024-edge fixture crosses multiple merge levels and resumes before shape, after shape, and after publication. Detail EOF drops from 589,824 to 74,752 bytes; measured construction peak drops from 2,170,880 to 1,134,592 bytes. Exact allocation and reference inventories include zero-byte files, with persistent lifecycle/writer locks initialized before the fixture baseline. This establishes a representation reduction; #901/#900/#745 retain host-capacity qualification.

Validation includes codec boundaries and malformed input, both-version crash/cancel/corruption/retry, 89 affected storage tests, exact public construction/reopen/portable verification/import results including nullable properties and ordinals, and full lifecycle 1x/2x/4x phase accounting. The existing application-byte fixture uses proportionally more rows to exceed its unchanged fixed-overhead floor; phase ceilings remain enforced. The tiny construction test now derives its exact fsync count and tighter merge footprint bound from compact wire sizes, replacing legacy padded-size assumptions. Workspace Clippy, final formatting, make pre-push-fast, and gate-registry checks pass. Exact-head Bazel CI also runs the real default tiny lifecycle and full-owner 1x/2x/4x growth workload before merge.

Closes #1172

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