* feat(pi): inject permission mode into agent process env
The pi permission-gate extension runs inside the pi CLI and has no way
to learn cc-connect's permission mode. When a user switches to yolo
(auto-approve) mode in Feishu, the engine restarts the session, but the
new pi process is still spawned without any mode hint, so the extension
keeps emitting permission cards.
Inject CC_PERMISSION_MODE=<mode> into the spawned pi process environment
in StartSession. The extension reads it and auto-approves all tool calls
in yolo mode. Mode switches already recreate the session (pi does not
implement LiveModeSwitcher), so the new process picks up the new value.
* test(pi): check Close error in StartSession test to satisfy errcheck
* refactor(pi): move permission-mode env injection into core helper
Extract the hardcoded CC_PERMISSION_MODE append into core.InjectedAgentEnv
so the env var becomes a documented, reusable part of cc-connect's CC_*
extension contract instead of a one-off string in the pi agent. Other
agents can opt into the same convention.
Add TestAgent_StartSession_UserOverrideWins to lock in that the
engine-injected value is appended after config/session env, so a
user-supplied CC_PERMISSION_MODE keeps priority (getenv returns the first
match).
* fix(pi): fall back to models-store.json when enabledModels is unset
AvailableModels only read enabledModels from settings.json, which is
empty by default. /model in Feishu then renders an empty select with
only the current model, making model switching impossible.
Fall back to pi's own model catalog (~/.pi/agent/models-store.json),
which pi maintains as providers are added, when enabledModels is not
configured.
* test(pi): cover models-store.json fallback in readModelsStore
Add TestReadModelsStore mirroring TestReadSettingsModels: missing file,
valid file sorted provider-qualified, empty-id skip, and malformed JSON.
Add TestAgent_AvailableModels_FallsBackToStore for the enabledModels-empty
→ catalog fallback path.
Clarify in loadModelsContextWindows that models.json (context windows) is
distinct from models-store.json (the /model catalog).
baizhu945