Rebuild Studio UI, require real model generation, and add MCP

[Ankit6149]

Product changes

• rebuild Step 1 as a deliberate two-column evidence workspace instead of leaving half the screen empty
• rebuild Step 2 with destination selection on the left and an always-visible model route panel on the right
• add provider discovery, recommended configured route selection, readiness status, model override, temporary-key handling, and a tested connection action
• remove Local Template from the Studio workflow
• reject template, offline, prompt-only, missing, and unsupported generation modes at the API and orchestration layers
• stop silently substituting deterministic copy when strategy or destination generation fails
• preserve successful destinations while clearly marking failed destinations; fail the whole request when every destination fails
• keep hosted server keys available only to authenticated owner sessions
• keep custom, Ollama, and LM Studio endpoint execution owner-only
• require a reachable endpoint for local-model routes on hosted deployments

MCP server

• add a zero-dependency Node stdio MCP server under mcp/
• expose provider status, provider connection testing, and campaign creation tools
• use the same /api/launch_kit route as Studio so web and agent workflows share one generation engine
• read workspace/provider secrets from the MCP process environment instead of model-visible tool arguments
• enforce MCP initialization before tool use
• return JSON-RPC protocol errors for unknown tools
• keep campaign generation review-first; the MCP server does not publish content

Exact-head verification

Commit a204e88aad22b906bdd26bff2cb31387845d4e92 passed:

• frontend regression tests
• production dependency audit
• full Next.js production build
• MCP protocol and tool tests
• Python test suite
• Vercel preview build

No Playwright was used.

A real paid/cloud-provider generation was not executed because no provider credential was supplied to this validation run. Provider calls remain gated behind the explicit Test connection action and return real errors rather than template content.

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Project	Deployment	Actions	Updated (UTC)
signal-flow-studio	Ready	Preview, Comment	Jul 27, 2026 10:02am

[Ankit6149]

Post-merge branch audit: this task is already integrated into master through this merged PR. Do not merge the retained source branch again; start any follow-up work from current master in a new issue-specific branch.