The browser vault now draws from three login sources behind one handle
shape: the local encrypted vault (vault_…), 1Password Login items (op:…)
and Bitwarden Password Manager logins (bw:…). browser_vault_list aggregates
metadata across them; browser_vault_fill routes by prefix and resolves the
password at fill time only, through the manager CLI.
External managers are locked until the user unlocks them for the current
session. The new browser_vault_unlock tool (and the fill path, implicitly)
asks the surface to show a masked master-password prompt — CLI panel
(reuses the sudo panel state), TUI/Desktop via a vault.unlock.request
blocking card. The password goes to `op signin --raw` / `bw unlock --raw`
on stdin, never argv or env; only the session token is kept, in memory,
with a 30-minute idle TTL, cleared on session close or `vault.lock`.
Headless contexts (cron, webhook, api_server, -q) can never prompt: the
manager is reported as locked with unlock=unavailable_in_this_session and
fill refuses — the same posture approvals take where nobody can answer.
Config: vault.onepassword / vault.bitwarden {enabled, binary_path, …};
a 1Password service-account token skips the prompt for headless use.
RPC: vault.sources, vault.source.set, vault.unlock, vault.lock for Settings.
Tests (2, real subprocess against a fake bw; each proven red by sabotage):
headless never prompts or spawns; unlock feeds stdin only, token never
enters os.environ, fill routes by prefix and the password only reaches the
fill script.
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