REVERT cloud routing on hot path — back to local Ollama per PRD line 70

PRD line 70: "Everything runs locally — no cloud APIs, total data privacy."
Yesterday's PR #13 (feb638e) violated this by routing customer-facing
inference paths to opencode + ollama_cloud + openrouter. Reverting the
hot-path routes only; cloud providers stay configured in providers.toml
for explicit dev-tool opt-in.

Reverted:
- modes.toml staffing_inference: kimi-k2.6 → qwen3.5:latest (local Ollama)
- modes.toml doc_drift_check: gemini-3-flash-preview → qwen3.5:latest
- execution_loop overseer: opencode/claude-opus-4-7 → ollama/qwen3.5:latest
  Was a paid Anthropic call on every overseer escalation; now local + free.

Gateway compiles + restarts clean. Lance smoke 10/10. Live providers list
unchanged (kimi/ollama_cloud/opencode/openrouter all still CONFIGURED;
they just aren't ROUTED to from the staffing inference path anymore).

This stops the API meter on customer requests. Cloud providers remain
opt-in via explicit provider= caller hint, which the scrum tool +
auditor pipeline + bot/propose use deliberately.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

config/modes.toml

@@ -40,14 +40,13 @@ matrix_corpus = "chicago_permits_v1"
 name = "staffing_inference"
 # Staffing-domain native enrichment runner — Pass 4 (2026-04-26).
 # Same composer architecture as codereview_lakehouse but with staffing
-# framing + workers corpus. Validates that the modes-as-prompt-molders
-# pattern generalizes beyond code review.
+# framing + workers corpus.
 preferred_mode = "staffing_inference_lakehouse"
 fallback_modes = ["ladder", "consensus", "pipeline"]
-# 2026-04-28: gpt-oss-120b:free → kimi-k2.6 via Ollama Pro. Coding-
-# specialized, faster than gpt-oss, on the same OLLAMA_CLOUD_KEY so
-# no extra provider hop.
-default_model = "kimi-k2.6"
+# 2026-05-03: REVERTED to local. PRD line 70 — everything runs locally,
+# no cloud APIs on the customer hot path. Cloud models stay available
+# in providers.toml for explicit dev-tool opt-in (scrum, auditor).
+default_model = "qwen3.5:latest"
 matrix_corpus = "workers_500k_v8"
 
 [[task_class]]
@@ -61,9 +60,8 @@ matrix_corpus = "kb_team_runs_v1"
 name = "doc_drift_check"
 preferred_mode = "drift"
 fallback_modes = ["validator"]
-# 2026-04-28: gpt-oss:120b → gemini-3-flash-preview via Ollama Pro.
-# Speed leader on factual checking, same OLLAMA_CLOUD_KEY.
-default_model = "gemini-3-flash-preview"
+# 2026-05-03: REVERTED to local per PRD line 70.
+default_model = "qwen3.5:latest"
 matrix_corpus = "distilled_factual_v20260423095819"
 
 [[task_class]]