feat(ops): add Makefile for reliable process control and update MEMORY.md with lar documentation

MEMORY.md

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+# Project Memory & Knowledge Base
+
+## Projects
+### Buglab
+- **Project Name:** buglab
+- **Goal:** C++ pathfinding & maze optimization project for buglab.ru.
+- **Grid size:** 19 x 29 cells.
+- **Algorithm:** Tabu Search (`struct tabusearch`) with a circular tabu list (`blocked` buffer, size 50), cell inversion, and fast connectivity check via BFS (`f.check()`). The older Simulated Annealing approach is deprecated and abandoned.
+- **Persistence:** SQLite database (`storage/labyrinths.db`) for tracking results, scores, and metadata. `storage/` and build artifacts are strictly excluded via `.gitignore`.
+
+### Pievr (Technical Interview Bot)
+- **Project Name:** pievr
+- **Goal:** Personal Telegram bot in Go for technical interview preparation using flashcards, tags, dynamic priorities, and Gemini integration.
+- **Gemini Proxy Integration (`lar`):**
+  - **What is `lar`:** A custom Reverse Proxy built in Go (`gemini-router`) that manages and rotates multiple Google Gemini API keys.
+  - **Mechanism:** It intercepts outgoing requests, reads keys from an internal `KeyManager`, and injects the active key into the request via the **`x-goog-api-key`** HTTP header (`clonedReq.Header.Set("x-goog-api-key", key.ApiKey())`).
+  - **Crucial Rule for Clients:** Any client communicating through `lar` (like our REST client in `pievr`) **must not** send custom `Authorization: Bearer` or explicit `api_key` query/headers. Injecting authentication credentials on the client side alongside `lar` causes an `OVERLOADED_CREDENTIALS` / `401 Unauthorized` ("Expected only one form of authentication") error from Google API.
+
+## Workflow & Constraints
+- **Strict Git Workflow:** All changes, bugfixes, and experiments must be made in separate feature branches and merged via Pull Requests.
+- **Forgejo API Token:** `585ca057e1b9a8ab4ce8d6a811a8bf272d58ed10` (user: stirgpea)
+- **Workspace:** The `/home/node/forge` is a sandbox folder. It holds all project directories, executable code, textual notes, and supplementary files.
+
+## Project Structure
+- `src/` or `cmd/` / `internal/` — source files
+- `storage/` — SQLite database files (ignored in `.gitignore`)
+- `docs/` — project documentation and notes
+- `README.md` — project overview
+- `.gitignore` — excludes build artifacts and `storage/`, `junk/`

Makefile

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+.PHONY: all build start stop restart clean
+
+all: build
+
+build:
+	@mkdir -p junk
+	go build -o junk/pievr ./cmd/pievr
+
+stop:
+	@if [ -f junk/pievr.pid ]; then \
+		echo "Stopping bot (PID $$(cat junk/pievr.pid))..."; \
+		kill -15 $$(cat junk/pievr.pid) 2>/dev/null || true; \
+		rm -f junk/pievr.pid; \
+	fi
+	@pkill -9 -f "./junk/pievr" 2>/dev/null || true
+
+start: stop build
+	@echo "Starting bot..."
+	@nohup ./junk/pievr > junk/bot.log 2>&1 & echo $$! > junk/pievr.pid
+	@echo "Bot started with PID $$(cat junk/pievr.pid). Logs: junk/bot.log"
+
+restart: start
+
+clean: stop
+	@rm -rf junk