feat: authored first-message presets — auto-seed on session-create (v0.19.8)
Codifies 'give an agent a first message' (Worldtree #347): new module ratatoskr.first_message (FIRST_MESSAGE_PRESETS + seed_preset_first_message) seeds a preset agent's opening as a #347 authored turn-0 on every new session, wired into all three create paths — cli._amain (--send --new), tui._resolve_then_run (bare --new), web._create_session_endpoint (POST /api/sessions). seed_preset_first_message is strictly best-effort (INV-001): it soft-guards its inputs (return None, never assert), bounds the write with asyncio.wait_for so a stalled /history can't block create (the CLI/TUI clients disable read timeout for SSE), and swallows every exception except asyncio.CancelledError (which propagates) — so it can NEVER raise into or block the session-create path it is wired into. Per-content idempotency key → idempotent replay, no dup. Seeded with ratatoskr:sindra, whose opening greeting moved out of her card: her live system_prompt was PATCHed (non-destructive) to drop the Startup workaround the #347 first-message now replaces. Quality gate (both cross-frontier panels): heid-code-review returned zero implementation drift (2 test-only fixups applied); heid-bug-hunt caught the gap the conformance lens can't see — code matched the contract's narrow ERROR_ROUTING but INV-001's 'never raises' is broader — driving the broad-except + soft-guard + wait_for hardening above. Contract docs/contracts/first_message.contract.md (module-scoped, validated). TDD: 12 unit + 1 web wire-in; the 3 existing sindra bind tests gained a history-endpoint mock (creating a preset agent now auto-seeds). Suite 615 green, ruff+mypy clean. Auto-seed live-proven generation-free against personal :8081.
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