feat(#19): ephemeral-template (Echo) session creation
create_session could only mint foundational sessions; an ephemeral template
(agent_id="echo") returned 422 ephemeral_requires_config because ratatoskr never
sent the required config block — Echo was uncreatable, surfacing as an opaque
session_api_failed at the CLI. Thread an opaque, role/model-agnostic config
passthrough through the create path so Echo sessions are creatable.
- sessions.py: create_session(config=...) verbatim passthrough (PRE-004 Mapping /
PRE-005 config-xor-bifrost guards); SessionInfo gains kind + config, captured
defensively (.get) on both create and list.
- cli.py: --system-prompt flag builds config={"system_prompt": ...} (validation:
non-empty, requires --new+--agent, xor bifrost); _amain surfaces kind=; the
--whoami renderer now reads allowed_roles/default_role (was reading the dead
allowed_models/default_model) and tolerates a malformed capabilities shape.
- contract #2 amended (Amendment 2026-07-18); Heid-panel contract-reviewed +
diff-scoped bug-hunted (one whoami null-join gap found + fixed).
Canonical grounding: config.role, never config.model (worldtree-dev althing
01KXT976NN91DRBZBPXNZ2BVZR; ADR-0012 role cutover). Verified end-to-end against
the live v0.16.2 target. TDD across create + CLI; full suite green (534).
Closes #19.
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