ci(authoring): integrate packed acceptance into documentation stack

[777genius]

The documentation stack still inherits the old native workflow, which rejects skipped packed fixtures without scheduling their required execution. This composes the reviewed CI changes from #172 with #180 so the stack runs the dedicated packed proof and native aggregate on one commit.

Stacked on #180; also depends on #172. The merge preserves both histories, with no conflict resolution or additional implementation edits. Do not merge this into main independently of the upstream release/documentation gates or into a temporary dependency base as a delivery shortcut.

Validation on 6549f83: 12 packed-checker tests, 17 native-result-checker tests, and the workflow structural checker passed. Native and actual packed execution on this commit passed in run 34136843898 (all four native hosts, packed Linux amd64, and the required aggregate). The 10-file diff is the existing #172 change (1,033 additions / 110 deletions).

Known holds remain: Windows native failures and the restricted reproducer, macOS qualification, and public activation. The two README contract failures in Polyglot are separately being corrected; this PR does not hide or waive them. No public deployment or release is claimed.

Artifact verification: all four native Go event streams contain no failures and report both entrypoints across five templates at the exact head. Linux retains one optional Unix-socket fixture skip per host; Windows has no skips. The packed archive independently passed 7,662 indexed file hashes, 741 invocation records, 10 project inputs, and 30 unique plans; all execution phases exited zero. This is archived execution evidence, not relocated live-tree verification or release attestation. macOS remains unproven.

Polyglot run 34136843981 failed in both OS lanes on the known README contract assertions (contract_clarity_integration_test.go:221 and starter_template_sync_integration_test.go:52). Both source-acquisition lanes passed. This PR remains draft; green native CI does not resolve the historical Windows intermittent race or authorize public activation.

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