Bootstrap session context with get_session_context

Goal: fetch a repository’s open milestones and, optionally, a Projects v2 board’s state in one call — the equivalent of what Claude Code’s session-start.mjs hook injects automatically, for any MCP host that has no such hook.

Prerequisites

Read access to the target repository and (if requesting board state) the target project.

Steps

For milestones only:

{ "owner": "your-org", "repo": "your-repo" }

For milestones plus board state, add the project fields:
```
{
  "owner": "your-org",
  "repo": "your-repo",
  "projectOwnerLogin": "your-org",
  "projectNumber": 1
}
```
projectOwnerType defaults to organization; pass "user" for a user-owned project.
Read the response: { openMilestones: [...], projectBoard: {...} | null, projectConfigPath: string | null }.

Verify it worked

openMilestones matches list_milestones called with state: "open".
projectBoard is null unless you supplied both projectOwnerLogin and projectNumber — supplying only one still returns null for projectBoard, it does not error.
When non-null, projectBoard has the same shape as get_project_items’s result.
If projectBoard came back null and you expected board config to be picked up automatically, check projectConfigPath first: null there means the MCP server never found .config/gdlc/config.yml searching upward from its own cwd — most often because the server was launched from a directory above your repo (a multi-repo workspace root), which upward search cannot resolve (issue #106 / ADR-0005). Configure the global layer ($XDG_CONFIG_HOME/gdlc/config.yml) instead, or launch from the repo itself.