* fix(desktop): show Hindsight memory provider
* feat(desktop): configure Hindsight memory provider
* fix(desktop): limit Hindsight modes to supported setup
* refactor(desktop): generic memory-provider config surface
Replace the bespoke Hindsight settings surface with a declarative,
schema-driven path so adding a memory provider is pure declaration —
no per-provider page, conditional, or endpoint.
- memory_providers.py: declarative registry. Each provider lists its
fields {key, label, kind, default, options, secret-vs-plain}. Hindsight's
mode is a select(cloud, local_external), so rejecting local_embedded
falls out of generic enum validation instead of a hand-written check.
- One generic endpoint pair GET/PUT /api/memory/providers/{name}/config.
GET returns declared fields + current values (secrets only as is_set,
never read back); PUT validates selects against their options, writes
plain fields to the provider config file, secrets to the env store,
and flips memory.provider.
- ProviderConfigPanel renders straight from the schema, replacing
hindsight-settings.tsx and the memory.provider === 'hindsight'
conditional in config-settings.tsx — same pattern as
toolset-config-panel.tsx off env_vars.
Scoped to memory providers; storage layout is unchanged so the runtime
Hindsight plugin reads the same config.json / HINDSIGHT_API_KEY / provider
keys as before. Tests cover the registry, endpoint behavior (defaults,
write+secret, select rejection, unknown provider, secret-never-returned),
and the generic panel.
