Move "Bun fullstack dev server" to be its own thing separate from "Vanilla"

[yamcodes]

Fixes #1015

This PR enhances the arkenv init command to support both Vanilla Bun runtime usage and full-stack/frontend bundling via Bun's dev server (Bun.serve) or programmatic Bundler (Bun.build).

Changes:

• Pivot to Vanilla Default: Optimized the workflow for the majority of Bun users. Vanilla integration is now the default, emphasizing type-safe usage via the env object without needing build-time plugins.
• Bun Full-Stack Application Grouping: Grouped Fullstack dev server (Bun.serve) and Fullstack programmatic bundler (Bun.build) under a single category for better clarity on when they are needed (specifically for static inlining of environment variables).
• Refined Detection: Automatically detect usage of Bun.serve or Bun.build to suggest optional inlining integration.
• Terminology Refinement: Removed confusing "build-time" grammar from Bun Fullstack descriptions, replacing it with "Static Inlining" and "static replacement during bundling".
• Vocabulary Alignment: Updated CONTEXT.md and CLI strings to use "Vanilla" terminology, "Fullstack" specific grammars, and imperative verbs.
• Improved Type Safety: Updated ProjectOptions and ScaffoldingPlan to handle optional properties more strictly (exactOptionalPropertyTypes).

[pullfrog]

Pullfrog stalled — likely cause: rate limited (429)

The agent stopped emitting events for 300s and was killed by the activity-timeout watchdog. No events were emitted before the failure.

Recent agent stderr

... (older lines truncated)
ission mode.","parameters":{"required":["branchName"],"type":"object","properties":{"branchName":{"description":"Remote branch to delete","type":"string"}}}},{"name":"pullfrog_create_pull_request","description":"Create a pull request from the current branch","parameters":{"required":["base","body","title"],"type":"object","properties":{"base":{"description":"the base branch to merge into (e.g., 'main')","type":"string"},"body":{"description":"the body content of the pull request","type":"string"},"title":{"description":"the title of the pull request","type":"string"},"draft":{"description":"if true, create the pull request as a draft. use when the user explicitly asks for a draft PR.","type":"boolean"}}}},{"name":"pullfrog_update_pull_request_body","description":"Update the body/description of an existing pull request","parameters":{"required":["body","pull_number"],"type":"object","properties":{"body":{"description":"the new body content for the pull request","type":"string"},"pull_number":{"description":"the pull request number to update","type":"number"}}}}]}],"toolConfig":{"functionCallingConfig":{"mode":"AUTO"}}},"statusCode":429,"responseHeaders":{"alt-svc":"h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000","content-length":"308","content-type":"text/event-stream","date":"Sun, 17 May 2026 09:02:44 GMT","server":"scaffolding on HTTPServer2","server-timing":"gfet4t7; dur=256","vary":"Origin, X-Origin, Referer","x-content-type-options":"nosniff","x-frame-options":"SAMEORIGIN","x-xss-protection":"0"},"responseBody":"{\n  \"error\": {\n    \"code\": 429,\n    \"message\": \"Your project has exceeded its monthly spending cap. Please go to AI Studio at https://ai.studio/spend to manage your project spend cap. Learn more at https://ai.google.dev/gemini-api/docs/billing#project-spend-caps. \",\n    \"status\": \"RESOURCE_EXHAUSTED\"\n  }\n}\n","isRetryable":true,"data":{"error":{"code":429,"message":"Your project has exceeded its monthly spending cap. Please go to AI Studio at https://ai.studio/spend to manage your project spend cap. Learn more at https://ai.google.dev/gemini-api/docs/billing#project-spend-caps. ","status":"RESOURCE_EXHAUSTED"}}}} stream error
ERROR 2026-05-17T09:02:44 +0ms service=session.processor error=Your project has exceeded its monthly spending cap. Please go to AI Studio at https://ai.studio/spend to manage your project spend cap. Learn more at https://ai.google.dev/gemini-api/docs/billing#project-spend-caps.  stack="AI_APICallError: Your project has exceeded its monthly spending cap. Please go to AI Studio at https://ai.studio/spend to manage your project spend cap. Learn more at https://ai.google.dev/gemini-api/docs/billing#project-spend-caps. \n    at <anonymous> (../../node_modules/.bun/@ai-sdk+provider-utils@3.0.20+d6123d32214422cb/node_modules/@ai-sdk/provider-utils/dist/index.mjs:936:18)\n    at processTicksAndRejections (native:7:39)" process
INFO  2026-05-17T09:02:44 +1ms service=bus type=session.status publishing

  ^{｜ Rerun failed job ➔ ｜ View workflow run ｜ via Pullfrog ｜ Using Gemini Pro ｜ 𝕏}

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