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8c0e8cb165 fix(desktop): make agent definition authoritative for model/provider/prompt (#1968 )

## Summary

Introduces a single effective-config resolver that makes agent
definitions authoritative for model, provider, system prompt, and
relay-mesh routing on linked instances. Stale materialized record bytes
are never consulted at spawn, deploy, readiness, hash, card summary, or
mesh preflight.

**Resolution semantics (field-specific):**
- **model/provider (linked):** definition → global. `None` = inherit
global default. Record value never consulted.
- **model/provider (definition-less):** instance → global.
- **system_prompt (linked):** strictly from definition; blank = no
prompt. No global tier for prompt.
- **system_prompt (definition-less):** from the instance.
- **relay-mesh preflight (both):** driven by the same
`resolve_effective_config` resolution spawn's mesh env consults. For a
linked instance the record's own `provider`/`model`/`relay_mesh` bytes
are never consulted; for a definition-less instance with no provider of
its own, the legacy marker and env preset are the last fallback (see
below).
- **Orphaned (linked record, definition missing):** spawn, deploy, and
mesh preflight blocked with actionable user-facing error.

**Changes:**
- New `effective_config` resolver module with `ConfigSource` metadata
(`definition`, `global`, `instance_legacy`)
- All consumers routed through the single resolver: local spawn, deploy,
readiness, spawn hash, card summary, relay-mesh preflight (interactive
start and restore-on-launch)
- `apply_persona_snapshot` no longer preserves stale record
model/provider when definition is blank
- Backend `update_managed_agent` blocks model/provider/prompt writes for
linked records
- Frontend omits model/provider/systemPrompt submission for linked
instances; system prompt override hidden
- `model_source` field added to `ManagedAgentSummary` so card labels
distinguish inherited (`Default model (X)`) from explicit
- Spawn hash now digests resolved model/provider (not raw record fields)
so global default changes trip the restart badge even for runtimes
without `model_env_var`
- Orphan spawn/deploy/mesh-preflight blocked with jargon-free error
("This agent's configuration is missing — it may still be syncing or was
deleted on another device")
- `EffectiveAgentConfig::relay_mesh_model_id()` and
`resolve_effective_relay_mesh_model_id()` added; both mesh preflights
(`start_local_agent_with_preflight`, `restore_managed_agents_on_launch`)
call this instead of the deleted
`relay_mesh_config`/`relay_mesh_model_id` record-byte sniffs
- Legacy relay-mesh records keep their mesh routing. Two shipped
generations predate `provider: "relay-mesh"` and are never rewritten on
load: the typed `relay_mesh` marker (added when `ManagedAgentRecord` had
no `provider` field), and before it the mesh preset written directly
into `env_vars`. `resolve_definition_less` falls back to the marker,
then to the env preset, so these records still resolve to mesh instead
of silently misrouting to an unrelated provider while their stale env
bytes reach the child. The fallback is skipped when the record carries
an explicit `provider` — that states current intent, including a switch
away from mesh — and `resolve_linked` has no legacy fallback at all
- The env discriminator accepts both spellings of the two sentinels
renamed in the Jun-11 window without a record migration: the provider
env key (`BUZZ_AGENT_PROVIDER`, previously `SPROUT_AGENT_PROVIDER`) and
the api-key value (`buzz-mesh-local`, previously `sprout-mesh-local`).
Each is independent, since a record can straddle the window; the current
provider-key spelling wins when both are present
- Dead `persona_field_with_record_fallback` and wrapper
`persona_snapshot_with_agent_config_fallback` deleted; callers use
`persona_snapshot` directly
- New resolver/deploy/hash/write-guard/mesh-preflight tests, including
switch-away and global-inheritance regressions for both mesh preflight
call sites, per-class legacy-mesh resolution (typed marker and env
preset, in every rename-window spelling combination), and the paired
assertions that a linked instance's legacy mesh bytes stay inert

---------

Signed-off-by: Will Pfleger <pfleger.will@gmail.com>
Co-authored-by: npub1mn7jgtj4w2pd0g0zeuhxsa6jy6p0rewxz4kujt98my82ahfmp72sxjexk7 <dcfd242e557282d7a1e2cf2e6877522682f1e5c6156dc92ca7d90eaedd3b0f95@buzz.block.builderlab.xyz>

2026-07-26 12:30:33 -04:00