Add Support For Qoder

[autoberry]

Summary

Add Qoder CLI as a native installer target for codegraph install.

When ~/.qoder/ (global) or /.qoder/ (local) is detected, the installer auto-selects Qoder
CLI in the multiselect prompt and writes mcpServers.codegraph into the corresponding
settings.json. The operation is fully idempotent and reversible via --uninstall. Users can also
target it explicitly with --target=qoder.

Motivation

Qoder CLI (https://github.com/qoder-ai/qodercli) is a growing AI coding agent that supports MCP
servers via settings.json. Adding first-class support in Codegraph's installer allows Qoder users
to onboard with a single codegraph install command, matching the existing experience for Claude
Code, Cursor, Codex, etc.

Changes

File	Description
src/installer/targets/qoder.ts	New QoderTarget class implementing AgentTarget interface
src/installer/targets/registry.ts	Register qoderTarget in ALL_TARGETS
src/installer/targets/types.ts	Add 'qoder' to TargetId union
tests/installer-targets.test.ts	8 new tests covering install/detect/uninstall/idempotency
CHANGELOG.md	Document the new feature
README.md	Add Qoder CLI to the supported agents list
package.json	Version bump to 1.0.0-beta.1

Design Decisions

• Settings only — Qoder CLI has no permissions system or instructions file, so the target only writes mcpServers.codegraph to settings.json (not settings.local.json or AGENTS.md).
• Non-destructive merge — Existing keys in settings.json (other mcpServers, user preferences) are preserved.
• Idempotent — Re-running install when the config already matches returns action: 'unchanged' without rewriting the file.
• Clean uninstall — Removes only mcpServers.codegraph; if mcpServers becomes empty, the key is removed entirely.

Test Plan

• npm test — all existing + new tests pass
• Manual: run codegraph install --target=qoder on a machine with ~/.qoder/ and verify settings.json is correctly written
• Manual: run codegraph install --target=qoder --uninstall and verify the entry is cleanly removed
• Manual: verify install preserves existing MCP server entries in settings.json