Seed specs/ directory with initial plan

specs/PLAN.md

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+# YouTrack CLI Plan
+
+## Goal
+
+Build a Rust CLI app that uses the `youtrack-client-api` crate to expose practical YouTrack workflows from the terminal.
+
+The CLI should:
+
+- map cleanly onto the SDK's existing resource modules
+- support both human-readable and machine-readable output (table, JSON, YAML)
+- work against any YouTrack instance (cloud or self-hosted)
+- keep app code isolated from direct SDK details where that improves maintainability
+
+## Dependency Baseline
+
+- repo: `ghostspice/youtrack-client-api`
+- branch: `0.1.x`
+- crate name: `youtrack-client-api`
+- crate version: `0.1.0`
+- edition: `2024`
+
+## Current Scope
+
+### Implemented
+
+- Issue management: `issue list`, `issue get`, `issue create`, `issue update`, `issue delete`
+- Comment management: `comment list`, `comment add`, `comment update`, `comment delete`
+- Attachment management: `attachment list`, `attachment upload`, `attachment delete`
+- Table and JSON output formats
+- Authentication via environment variables, compile-time embedding, or interactive prompt
+
+### Planned
+
+- YAML output format (`--output yaml`)
+- `--verbose` / `--quiet` global flags with tracing
+- Config file support (`~/.config/youtrack-cli/config.toml`)
+- Locked-build mode via `build.rs` (parity with gitlab-cli)
+- `app.rs` refactor: thin `main.rs` + `AppContext` + command dispatch
+- Auth validation on token prompt (call `/api/users/me`)