Daemon must resolve model from profile config.yaml at spawn

[donovan-yohan]

Problem

hermes_bridge/__main__.py:350 reads model from os.environ.get(\"BELAYER_MODEL\", \"\"). The profile fork's config.yaml#model.default (written at materialization in internal/daemon/profiles.go:497-501) is never consulted at spawn time.

Daemon side at internal/bridge/bridge.go:190-192 only emits BELAYER_MODEL when cfg.Model != \"\". If the operator hasn't set a model on the daemon, the bridge passes no model kwarg to AIAgent, and the underlying transport posts an empty model field — Nous (and other providers) reject with HTTP 400 "Model parameter is required".

Symptom (from parley playtest)

bridge:failed
final_response: None
POST body: {\"model\": \"\", ...}

Workaround today: start daemon with BELAYER_MODEL=moonshotai/kimi-k2.6 belayer daemon .... This forces the same model on every talent in the crag — no per-talent model selection.

Proposed fix

Daemon's spawn path should:

1. Read the active profile fork's <fork>/config.yaml#model.default.
2. Export as BELAYER_MODEL for that bridge subprocess.
3. Per-talent override (later): allow talent.yaml#model to win over profile default.

Bridge code stays unchanged. Single-side fix in daemon.

Files

• internal/bridge/bridge.go:188-192 — model env emission
• internal/daemon/profiles.go:497-501 — formatProfileConfig (already writes model into the fork)
• internal/daemon/agents.go — spawn path that builds bridge config

Acceptance

• Daemon reads profile config.yaml#model.default and exports as BELAYER_MODEL when daemon's BELAYER_MODEL is unset.
• Test: spawn agent into a profile fork that has model.default: foo/bar, assert bridge subprocess receives BELAYER_MODEL=foo/bar.
• Test: explicit operator BELAYER_MODEL overrides profile default (operator wins).
• Test: missing model.default in profile config → empty BELAYER_MODEL → bridge omits kwarg (current behavior preserved).

Reference

• Parley devlog: ~/Documents/Programs/personal/parley/docs/devlogs/2026-05-04-belayer-profile-coupling-live-playtest.md — Gap 1.