[docs] ENG-3685 - Align the tested install prompt with what setup actually does

[mariojgt]

Closes ENG-3685

CLAUDE.md says the install prompt "appears in three places that must stay identical: README.md, GETTING-STARTED.md, and field-test/prompt.txt — prompt.txt is the artifact the harness tests." It has drifted, and two of the differences are functional rather than cosmetic.

Wrong dependency type

The tested prompt said dev dependency. README.md:21 says the opposite and explains why:

Protection imports @patchstack/connect/protect at runtime, so deployments that prune dev dependencies need the package in dependencies.

README.md:11 accordingly says "regular dependency". Real Lovable projects carry it in dependencies. So the prompt the harness validates was teaching agents to produce an install that breaks on the platforms this package targets.

Under-authorized effects

The tested prompt authorized "its widget and production build hooks". setup also runs protect, which edits source — and since #165, scan edits source too.

field-test/README.md records that effects exceeding what the prompt named is the refusal trigger, and that the prompt "now authorizes one explicit setup command and names its bounded effects inline" precisely to avoid it. An under-scoped authorization means the harness was under-testing the failure mode it exists to catch.

Both points now match README.md's wording. The hosted-workspace clauses stay out — PATCHSTACK_ENVIRONMENT=sandbox, "restart the preview server", and the sandbox non-persistence instruction are specific to that flow.

Still open: are two variants intended?

This closes the functional gap, not the structural one. The remaining differences look deliberate — README.md:11 is a hosted-builder variant, and README.md:23 documents that sandbox guidance on purpose.

If two variants are wanted, the "must stay identical" line in CLAUDE.md is stale and should say so, and the harness should exercise both. As it stands the hosted variant — the one facing the refusal-prone audience — is the copy never tested. Worth a decision from someone who owns the testing strategy; I did not want to guess at it inside a correctness fix.

Before merging

The field test has not been run. CLAUDE.md requires node field-test/run.mjs --persona hostile --rounds 3 for any prompt change, and unlike a CLI change this one is fully exercisable by it — the harness mocks the API and only the prompt shape is under test. It is runnable in this environment (claude -p against field-test/mock-api.mjs); I left it for a human to trigger because it spawns nested agents with permissions skipped and costs 30–50k tokens per round.

Given the change widens the authorization and corrects an install instruction, I would expect it to score no worse — but that is a prediction, not a result.

npm test unaffected: 1315 passed, 6 skipped. No code changed.

🤖 Generated with Claude Code

[coderbuds]

Aligned install prompt to reflect actual setup behavior for disclosure and runtime edits.

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[mariojgt]

/review