storkit: create 399_story_cli_port_flag_with_project_toml_persistence

.storkit/work/1_backlog/399_story_cli_port_flag_with_project_toml_persistence.md

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+---
+name: "CLI --port flag with project.toml persistence"
+---
+
+# Story 399: CLI --port flag with project.toml persistence
+
+## User Story
+
+As a developer, I want to set the server port via a --port CLI flag that persists to project.toml, so that I don't have to remember an environment variable on every run.
+
+## Acceptance Criteria
+
+- [ ] storkit --help shows a --port option
+- [ ] storkit --port 4000 starts the server on port 4000
+- [ ] After first run with --port, the port is saved to project.toml
+- [ ] On subsequent runs without --port, the port from project.toml is used
+- [ ] CLI --port overrides the value in project.toml
+- [ ] Default port is 3001 when neither --port nor project.toml port is set
+- [ ] STORKIT_PORT env var continues to work as lowest-priority fallback
+
+## Out of Scope
+
+- TBD