Implement pieces of planned Commands API in support of AI App Generator card

[lukemelia]

This PR does not include the finished vision for the Commands API, but it is a helpful merge point.

Still to-do in future PRS:

• get module creation working smoothly via commands
• sample data generation via commands
• Use loader to access host commands via import instead of loadCommand API
• Add tools to chat as roomState similar to how we treat Skills and attached Cards
• Update system prompt to make sure ai knows which tools are auto-executable and which are not

[github-actions]

Host Test Results

    1 files  ±0      1 suites  ±0   19m 31s ⏱️ -44s
683 tests +3  682 ✔️ +3  1 💤 ±0  0 ❌ ±0 
688 runs  +3  687 ✔️ +3  1 💤 ±0  0 ❌ ±0 

Results for commit 5cf45e7. ± Comparison against base commit 5172301.

This pull request removes 1 and adds 4 tests. Note that renamed tests count towards both.

Chrome 131.0 ‑ Integration | ai-assistant-panel: it only applies changes from the chat if the stack contains a card with that ID

Chrome 131.0 ‑ Acceptance | Commands tests: a command sent via sendAiAssistantMessage with autoExecute flag is automatically executed by the bot
Chrome 131.0 ‑ Acceptance | Commands tests: a command sent via sendAiAssistantMessage without autoExecute flag is not automatically executed by the bot
Chrome 131.0 ‑ Acceptance | Commands tests: a scripted command can create a card, update it and show it
Chrome 131.0 ‑ Integration | commands | switch-submode: switch to code submode

♻️ This comment has been updated with latest results.

[habdelra]

some minor items, but looks fine overall