Add restart option after pipeline completion in CLI and Web UI

[Copilot]

• Headless CLI (cli.py): After pipeline completes (success, abort, or failure), prompt user with 🔄 Run another calibration? [y/N] to perform another calibration or end the session. Pipeline execution is wrapped in a loop; run_id is auto-cleared for each new iteration.
• Web UI - JavaScript (app.js): When the pipeline completes, fails, or is aborted, status is detected via the /progress endpoint (no extra /status polling) and a restart bar is shown. resetUI() fully resets progress panel, stepper, logs, and restart bar.
• Web UI - Template (index.html): Added restart bar card in the progress panel with event listener wired in JS (no inline onclick).
• Backend (routes.py): /progress endpoint now includes status field to avoid separate /status polling.
• Tests (test_restart.py): 6 tests for _prompt_restart() covering yes, Yes, no, empty, EOF, and 'yes'-word rejection.
• PR review feedback addressed:
  • Handle aborted as terminal state alongside completed/failed
  • Eliminate separate /status polling by including status in /progress response
  • Remove inline onclick handler, wire restart button via addEventListener
  • Handle KeyboardInterrupt inside cmd_run() loop so Ctrl+C offers restart
• Code review and security scan: No vulnerabilities found.

Original prompt

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This section details on the original issue you should resolve

<issue_title>[RESTART?] option not implemented</issue_title>
<issue_description>Once the pipeline is finished, the user isn't given the option to perform another calibration or end the session. This should be implemented in both UI and headless modes.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [RESTART?] option not implemented #2

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[Copilot]

Pull request overview

Adds a “restart calibration” flow so users can run multiple calibrations in the same session, both in the headless CLI and the Web UI.

Changes:

• CLI: wraps cmd_run pipeline execution in a loop and prompts 🔄 Run another calibration? [y/N] after each run, clearing args.name between iterations.
• Web UI: detects terminal run states during progress polling and displays a restart bar with a “Start New Calibration” action that calls resetUI().
• Tests: adds unit tests for the CLI _prompt_restart() behavior across common inputs and EOF.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 5 comments.

File	Description
demandify/cli.py	Adds _prompt_restart() and loops cmd_run() to allow repeated headless runs.
demandify/static/js/app.js	Adds status checks during progress updates and shows a restart option on completion/failure.
demandify/templates/index.html	Adds a restart bar UI element and restart button.
tests/test_restart.py	Adds unit tests for _prompt_restart().

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