feat(authoring): consume paired v2 public inputs

[777genius]

Adds v2 input consumption to the shared public authoring runtime. Both products validate the paired input binding and use the existing verified cache path. An optional local asset locator is checked before cache effects, including warm hits. V2 packages contain the fixed 17-file closure; v1 behavior and useful YAML capabilities remain preserved.

Stacked on #216. Refs #219, #228, #208. Exact head: 3814f75; original base: 0d50e5b, retained in the consolidated parent history. Scope: 11 files, 1,433 changed lines (1,184 additions, 249 deletions), including a 186-line codec move.

The hosted writer reports 49 focused tests passing without skips: 10 runtime, 3 closure, 13 structural, 16 C1 pure and 7 v1 cases. The coordinator verified all 24 artifact checksums, 3,379 source entries, unowned preservation, original-base pins and full patch identity before committing. These checks do not replace independent review or real E2E.

Independent C2 review initially found one P2, C2-R1: missing terminal cancellation/input validation after awaited finalization. Fix 3814f75 adds 3 runtime lines and 59 regression-test lines. Independent gpt-6-astra low review ACCEPTED this exact fix: 54/54 tests passed, including both original reproductions and three terminal regression tests. All 20 review artifact checksums were verified, with source pins and unowned files preserved. Combined with the preceding full C2 review, the bounded C2 source finding is closed. Fresh successor CI is still running; genuine E2E and prerequisite acceptance remain separate.

Genuine authenticated custody, N2 acceptance, public/platform E2E, qualification, distribution readbacks and release remain open. No public release or main activation is authorized by this PR.

All 10 required GitHub CI checks passed at exact head 9a79a4a, including packed Linux and Windows polyglot. Those results apply to the previous head; successor CI is pending and C2-R1 is independently closed. CI is not full public E2E acceptance.

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