Threads / replies: schema, validation, thread view, reply compose

[iduartgomez]

Workstream split out from tracking #8.

Scope

• Extend ContractPost schema (web/src/freenet-api.ts:21 + contracts/posts/src/lib.rs): reply_to: Option<PostId>, thread_root: Option<PostId>, quoted_post: Option<PostId>.
• Validate reply chains in contracts/posts/src/lib.rs (signature check, parent existence).
• Thread view component (linear conversation rendering).
• Reply compose box scoped to parent post.

Dependencies

• Schema extension + validation should land first; UI components build on it.
• Design question: thread storage strategy (edges in posts contract vs. separate thread contract per root) — must be resolved before schema lands.

References

• web/src/freenet-api.ts — ContractPost TS interface.
• contracts/posts/src/lib.rs — Rust contract validation.
• web/src/components/compose-box.ts — current compose box (to be parameterized for reply context).

Parent: #8

[iduartgomez]

Status update (2026-05-27): storage strategy resolved; schema refs are stale; reply signing is unwired.

The thread storage design question in this issue is resolved by ADR-0001: replies/quotes/likes live in a per-root thread shard (contracts/thread-shard/, anyone-writes, self-verifying), NOT as edges in a global posts contract. The contracts/posts/ contract referenced here was removed in #33.

Current state:

• common::post::Post already carries the reply field, and the delegate has a SignPost path — but the delegate hardcodes reply_to = "" (delegates/identity/src/lib.rs), so reply signing is not yet wired through the UI. Quotes likewise unwired.
• Likes on the thread shard are done (feat: ADR-0001 Phase 4 slice 2 — thread shard likes E2E #31/fix: holistic shard review — GET serialization regression + test/doc gaps #35/fix: revert optimistic like toggle on completeLike failure #36).

Remaining for this issue: wire reply_to/quote through the delegate sign path + compose box, validate parent existence, render thread view. Update the schema/file references (contracts/posts → contracts/thread-shard + common/src/{post,thread}.rs).

[iduartgomez]

Note: the quoted_post field on common::post::Post (listed in this issue's scope) was implemented in #38 (quote repost, closing #14) — it's additive and mirrors the existing reply_to field. The reply-chain validation, thread view, and reply compose parts of this issue remain open.

[iduartgomez]

Update from #40: thread view UI ships (detail head + signed root with ML-DSA-65 seal + reply composer + responses list). Reply submit is wired via the AppCallbacks.reply hook in app.ts but the index.ts → freenet-api connection.publishReply path is not yet implemented, and reply validation on the thread shard contract is still open. Leaving this issue open to track the backend reply pipeline.