Extract traverse-core-rs shared HTTP/SSE crate for GTK and CLI (#141)

linux-gtk and cli-rust now depend on a workspace crate for send_command,
SSE subscribe_events, and server.json discovery, matching the web-react
command + event pattern from #43.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: enricopiovesan

AGENTS.md

@@ -14,7 +14,7 @@ gh project item-list 2 --owner traverse-framework --format json --limit 300 \
 - **Phase 3 embedded runtime** ([#109](https://github.com/traverse-framework/reference-apps/issues/109)–[#118](https://github.com/traverse-framework/reference-apps/issues/118)) — see `docs/embedded-runtime-plan.md`; blocked on a **consumable platform embedder SDK** (Traverse [#553](https://github.com/traverse-framework/Traverse/issues/553) closed via [#578](https://github.com/traverse-framework/Traverse/pull/578) with manifest `execution_mode` only — no web/Swift/etc. embedder package yet). Traverse [#615](https://github.com/traverse-framework/Traverse/pull/615) added wasm32 core build only — not a platform embedder package.
 - **doc-approval multi-capability showcase** ([#111](https://github.com/traverse-framework/reference-apps/issues/111), [#112](https://github.com/traverse-framework/reference-apps/issues/112)) — blocked on Traverse [#538](https://github.com/traverse-framework/Traverse/issues/538) / [#555](https://github.com/traverse-framework/Traverse/issues/555) (`extract` / `recommend` agents)
 
-Ready: [#110](https://github.com/traverse-framework/reference-apps/issues/110) traverse-starter.pipeline (Traverse [#620](https://github.com/traverse-framework/Traverse/issues/620) closed); [#59](https://github.com/traverse-framework/reference-apps/issues/59)/[#72](https://github.com/traverse-framework/reference-apps/issues/72)/[#73](https://github.com/traverse-framework/reference-apps/issues/73) shared client packages ([#58](https://github.com/traverse-framework/reference-apps/issues/58) in progress).
+Ready: [#110](https://github.com/traverse-framework/reference-apps/issues/110) traverse-starter.pipeline (Traverse [#620](https://github.com/traverse-framework/Traverse/issues/620) closed); [#72](https://github.com/traverse-framework/reference-apps/issues/72)/[#73](https://github.com/traverse-framework/reference-apps/issues/73) shared client packages ([#58](https://github.com/traverse-framework/reference-apps/issues/58) Done; [#59](https://github.com/traverse-framework/reference-apps/issues/59) in this PR).
 
 Update this section when a PR changes platform status (see PR template checklist).
 

README.md

@@ -173,6 +173,6 @@ Active blockers on [Project 2](https://github.com/orgs/traverse-framework/projec
 
 - **Phase 3 embedded runtime** ([#109](https://github.com/traverse-framework/reference-apps/issues/109)–[#118](https://github.com/traverse-framework/reference-apps/issues/118)) — all platform clients must bundle the WASM runtime host; blocked on a **consumable platform embedder SDK** (Traverse [#553](https://github.com/traverse-framework/Traverse/issues/553) closed via [#578](https://github.com/traverse-framework/Traverse/pull/578) with manifest `execution_mode` only; [#615](https://github.com/traverse-framework/Traverse/pull/615) is wasm32 core build only). HTTP sidecar is dev-only.
 - **doc-approval multi-capability showcase** ([#111](https://github.com/traverse-framework/reference-apps/issues/111), [#112](https://github.com/traverse-framework/reference-apps/issues/112)) — blocked on Traverse [#538](https://github.com/traverse-framework/Traverse/issues/538) / [#555](https://github.com/traverse-framework/Traverse/issues/555) (`extract` / `recommend` agents).
-- **traverse-starter.pipeline showcase** ([#110](https://github.com/traverse-framework/reference-apps/issues/110)) — blocked on Traverse [#620](https://github.com/traverse-framework/Traverse/issues/620) (pipeline execute surface never landed on `main`).
+- **traverse-starter.pipeline showcase** ([#110](https://github.com/traverse-framework/reference-apps/issues/110)) — Ready (Traverse [#620](https://github.com/traverse-framework/Traverse/issues/620) closed; pipeline on Traverse `main`).
 
-Ready on Project 2: [#58](https://github.com/traverse-framework/reference-apps/issues/58)/[#59](https://github.com/traverse-framework/reference-apps/issues/59)/[#72](https://github.com/traverse-framework/reference-apps/issues/72)/[#73](https://github.com/traverse-framework/reference-apps/issues/73) — shared HTTP/SSE client packages (Swift + Rust).
+Ready on Project 2: [#59](https://github.com/traverse-framework/reference-apps/issues/59)/[#72](https://github.com/traverse-framework/reference-apps/issues/72)/[#73](https://github.com/traverse-framework/reference-apps/issues/73) — shared HTTP/SSE client packages ([#58](https://github.com/traverse-framework/reference-apps/issues/58) Done).