feat: gitlock mcp

apps/gitlock_mcp/.formatter.exs

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+[
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]

apps/gitlock_mcp/lib/gitlock_mcp.ex

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+defmodule GitlockMCP do
+  @moduledoc """
+  Gitlock MCP Server — codebase intelligence for AI coding agents.
+
+  Exposes behavioral code analysis (hotspots, coupling, ownership, risk)
+  as MCP tools that AI coding agents like Claude Code and Cursor can use
+  to write safer code.
+
+  ## How it works
+
+  1. Agent connects via stdio
+  2. First tool call triggers repo indexing (parses git log, runs analysis)
+  3. Results cached in memory — subsequent queries are instant
+  4. Agent gets risk context before modifying files
+
+  ## Tools
+
+  - `gitlock_assess_file` — Risk assessment for a specific file
+  - `gitlock_hotspots` — Find riskiest files in a directory
+  - `gitlock_file_ownership` — Who owns this file? Knowledge silo risk?
+  - `gitlock_find_coupling` — What files change together with this one?
+  - `gitlock_review_pr` — Analyze a set of changed files together
+  - `gitlock_repo_summary` — Overview of codebase health
+  """
+end

apps/gitlock_mcp/lib/gitlock_mcp/application.ex

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+defmodule GitlockMCP.Application do
+  @moduledoc false
+  use Application
+  require Logger
+
+  @default_port 4100
+
+  @impl true
+  def start(_type, _args) do
+    port = Application.get_env(:gitlock_mcp, :port, @default_port)
+
+    children = [
+      GitlockMCP.Cache,
+      Hermes.Server.Registry,
+      {GitlockMCP.Server, transport: :streamable_http},
+      {Bandit, plug: GitlockMCP.Router, port: port}
+    ]
+
+    Logger.info("Gitlock MCP server starting on http://localhost:#{port}/mcp")
+
+    opts = [strategy: :one_for_one, name: GitlockMCP.Supervisor]
+    Supervisor.start_link(children, opts)
+  end
+end