refactor: move layout docs to CONTRIBUTING.md, fix module path

Move project layout documentation from go.mod comments to
CONTRIBUTING.md where contributors expect to find it. Fix module
path to match the actual repository (github.com/sergeyklay/sortie).

Co-Authored-By: Claude Opus 4.6 <[email protected]>

Author: sergeyklay

CONTRIBUTING.md

@@ -0,0 +1,21 @@
+# Contributing to Sortie
+
+## Project Layout
+
+Sortie uses the standard Go `cmd/internal` pattern:
+
+```
+cmd/sortie/            — main entry point, CLI flag parsing
+internal/domain/       — domain types: Issue, TrackerAdapter, AgentAdapter interfaces
+internal/config/       — workflow loader, typed config, prompt template rendering
+internal/orchestrator/ — poll loop, dispatch, reconciliation, retry, state machine
+internal/tracker/      — tracker adapter implementations (jira, file, etc.)
+internal/agent/        — agent adapter implementations (claude-code, mock, etc.)
+internal/workspace/    — workspace creation, path safety, hook execution
+internal/server/       — HTTP API and dashboard
+```
+
+The `internal/` directory enforces package-level encapsulation at the compiler
+level — external consumers cannot import internal packages. Each architecture
+component maps to one internal sub-package, keeping dependencies explicit and
+testable in isolation.

go.mod

@@ -1,19 +1,3 @@
-// Project layout: cmd/internal pattern (Go standard project layout).
-//
-// cmd/sortie/          — main entry point, CLI flag parsing
-// internal/domain/     — domain types: Issue, TrackerAdapter, AgentAdapter interfaces
-// internal/config/     — workflow loader, typed config, prompt template rendering
-// internal/orchestrator/ — poll loop, dispatch, reconciliation, retry, state machine
-// internal/tracker/    — tracker adapter implementations (jira, file, etc.)
-// internal/agent/      — agent adapter implementations (claude-code, mock, etc.)
-// internal/workspace/  — workspace creation, path safety, hook execution
-// internal/server/     — HTTP API and dashboard
-//
-// Rationale: the cmd/internal split is the dominant Go convention. The internal/
-// directory enforces package-level encapsulation at the compiler level — external
-// consumers cannot import internal packages. Each architecture component maps to
-// one internal sub-package, keeping dependencies explicit and testable in isolation.
-
-module github.com/sortie-ai/sortie
+module github.com/sergeyklay/sortie
 
 go 1.26.1