chore: add agent context files

Author: alpeerkaraca

.gitignore

@@ -79,3 +79,9 @@ infrastructure/ecs-fargate/.terraform.lock.hcl
 .gemini/agents/
 everspring_mcp.tar.gz
 scripts/reindex_all_tiers.sh
+
+.gemini/
+gha-creds-*.json
+
+# Gemini Context Files
+PROJECT_CONTEXT.md

GEMINI.md

@@ -0,0 +1,6 @@
+# System Instructions for Gemini CLI
+
+When working in the `everspring-mcp` project, you MUST adhere to the following rules:
+
+1. **Load Context:** At the beginning of any complex task, refactoring, or architectural discussion, read the `PROJECT_CONTEXT.md` file located in the root of the workspace to understand the system's architecture, data flows, and tiers.
+2. **Maintain Context:** If your changes introduce new core modules, alter the data pipeline (Scrape -> S3 -> Sync -> Index -> Serve), or change the tiered architecture (main, slim, xslim), you are required to update `PROJECT_CONTEXT.md` to reflect these changes.