fix: render the seeded first-message on the web UI (v0.19.9)
The #347 auto-seed worked (the greeting was in the session ledger at seq-0), but the web UI never showed it: there was no GET /api/sessions/{id}/messages route and startSession() went straight from create to persona/tools/admin hydration, so the transcript only filled from the live turn stream + user echoes — a seeded turn-0 was invisible. - server: new proxy route GET /api/sessions/{id}/messages -> get_session_messages (mirrors the tools/bifrost proxies; status-preserving envelope). - SPA: loadTranscript(sessionId) fetches it on open and renders existing turns (assistant -> .response .md-body via markdownSafe escape-first; user -> .prompt-echo via textContent), called after the workspace opens. Best-effort. web_debug_surface contract amended (endpoint + loadTranscript). 2 web route tests, suite 617 green. Playwright DOM check proved the render end-to-end (drive the real UI -> Sindra's greeting bubble appears).
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