v2.x: broader interoperability

[ChelseaKR]

A v2.x+ headline goal in ROADMAP.md's release horizons.

The evidence core, verifier, packet seal (ADR 0011) and joint submission index (ADR 0015) already define formats another tool could read. This item is about making that reach outward — so a packet is checkable by parties who never install habitable.

Imported from ROADMAP.md (release horizons, v2.x+) with AI assistance.

[ChelseaKR]

Triage: blocked on sequencing, with one buildable step already specified.

Verified on origin/main @ bf631af: the formats this item depends on exist. docs/adr/0011-authority-seal-over-the-whole-packet.md, docs/adr/0015-joint-multi-tenant-submission-index.md and docs/adr/0016-authority-seal-over-the-joint-index.md are all present, as is docs/embedding-the-verifier.md and docs/verifier-decision-table.md. So the premise — that habitable already defines formats another tool could read — holds.

This issue as written is a direction, not a specification: "make that reach outward" has no acceptance criterion, which is why nothing in it is buildable as stated. That is a fair thing for a v2.x horizon item to be, but it means it should not be picked up directly.

The concrete step out of it already has its own issue: #298, the single-file offline browser verifier, which quotes this issue's own phrasing ("a packet checkable by parties who never install habitable") and states testable done-when criteria. There is also unmerged prior art for it — see the note left on #298.

Suggested disposition for the owner: keep this as the horizon marker and let #298 carry the buildable part, or retire this in favour of #298 plus successors. Not something to settle in a triage pass.

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Triage pass against origin/main @ bf631af. Verdict only; nothing was changed. Prepared with AI assistance.