chore(harness): make repository agent-ready

Add concise routed context, task-aware agent roles, focused skills, and structured learning promotion.\n\nUnify local development and workspace tooling, add layered test and E2E verification, harden MCP authentication, and gate deployment behind verification and explicit production promotion.

.codex/skills/incident-triage/SKILL.md

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+---
+name: incident-triage
+description: Diagnose a Sauci development, CI, backend, or production symptom with evidence. Use for failures, regressions, logs, or unexplained runtime behavior; diagnosis alone does not authorize a fix or deployment.
+---
+
+# Incident triage
+
+Establish environment, time window, expected behavior, and blast radius. Reproduce
+locally when safe, inspect the narrow relevant logs and data boundary, and separate
+product bugs from stale tests or environment failures. Preserve exact error text
+without exposing secrets.
+
+Return evidence, confirmed cause or ranked hypotheses, affected scope, and the
+smallest recommended next action. Do not mutate production, implement a fix, or
+deploy unless the request explicitly includes it.