feat: core agent tools (fs, search, shell)

.living_spec/stories/archive/01_project_selection.md

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+# Story: Project Selection & Read Verification
+
+## User Story
+**As a** User
+**I want to** select a local folder on my computer as the "Target Project"
+**So that** the assistant knows which codebase to analyze and work on.
+
+## Acceptance Criteria
+*   [ ] UI has an "Open Project" button.
+*   [ ] Clicking the button opens the native OS folder picker.
+*   [ ] Upon selection, the UI displays the selected path.
+*   [ ] The system verifies the folder exists and is readable.
+*   [ ] The application state persists the "Current Project" (in memory is fine for now).
+
+## Out of Scope
+*   Persisting the selection across app restarts (save that for later).
+*   Scanning the file tree (just verify the root exists).
+*   Git validation (we'll assume any folder is valid for now).