Merge Note: first_model_provider must be NUKED

When merging upstream/master into integration/zerocode, after resolving conflicts, destroy ALL traces of first_model_provider and its family.

Definitions to delete (crates/zeroclaw-config/src/schema.rs)

• fn first_model_provider()
• fn first_model_provider_mut()
• fn first_model_provider_type()
• fn first_model_provider_alias()

Call sites to fix

• crates/zeroclaw-gateway/src/lib.rs — 4 usages (lines ~489, ~490, ~647, ~2136)
• crates/zeroclaw-providers/src/lib.rs — fallback logic, multiple usages (~660, ~715, ~724, ~753)
• crates/zeroclaw-runtime/src/agent/loop_.rs — temperature lookup (~4598)
• crates/zeroclaw-channels/src/orchestrator/mod.rs

What replaces it?

See commit a1665774b — "fix: delete first_model_provider*, enforce explicit provider alias resolution"

Root cause: first_model_provider* returned an arbitrary provider entry, causing cross-agent provider contamination (e.g. the_writer getting clamps' max_tokens=128000 instead of its own 64000).

Replacements (per a1665774b):

• provider_runtime_options_for_alias(config, family, alias)
• config.resolved_model_provider_for_agent(agent_alias)
• config.providers.models.find(family, alias)
• config.providers.models.iter_entries() for enumeration

Post-merge checklist

1. git merge upstream/master (resolve conflicts)
2. grep -rn "first_model_provider" crates/ — find every hit
3. Cherry-pick or manually replay a1665774b changes for each call site
4. cargo check — confirm it compiles
5. Commit with message: "nuke: remove first_model_provider family entirely"

Files touched in a1665774b (27 files)

• crates/zeroclaw-config/src/schema.rs
• crates/zeroclaw-config/src/providers.rs
• crates/zeroclaw-providers/src/lib.rs
• crates/zeroclaw-gateway/src/lib.rs, api.rs, api_onboard.rs, ws.rs
• crates/zeroclaw-channels/src/orchestrator/mod.rs, acp_server.rs
• crates/zeroclaw-runtime/src/agent/agent.rs, loop_.rs
• crates/zeroclaw-runtime/src/daemon/mod.rs, doctor/mod.rs, onboard/mod.rs, rpc/dispatch.rs, tools/mod.rs
• crates/zeroclaw-tools/src/model_routing_config.rs
• apps/tui/src/app.rs, chat.rs, client.rs
• src/commands/self_test.rs, main.rs, memory/cli.rs
• tests/component/config_persistence.rs, config_schema.rs