Add dedicated environment settings page and test-in-environment (#4798)

## Thinking Path

> - Paperclip orchestrates AI agents for zero-human companies
> - Agents run inside environments (local, SSH, E2B sandbox)
> - Operators need to configure and manage these environments
> - But environment settings were buried inside the general company
settings page, making them hard to find
> - Additionally, when testing an agent from the configuration form, the
test always ran locally regardless of which environment was selected
> - This PR moves environments into a dedicated top-level company
settings section and wires the "Test Environment" button to run inside
the selected environment
> - The benefit is operators can find and manage environments more
easily, and the test button now validates the actual environment the
agent will use

## What Changed

- Added a dedicated `CompanyEnvironments` settings page with its own
route and sidebar entry
- Updated `CompanySettingsSidebar` and `CompanySettingsNav` to include
the new environments section
- Modified the agent test route (`POST /agents/:id/test`) to accept an
optional `environmentId` parameter
- Updated all adapter `test.ts` handlers to resolve and use the
specified execution target environment
- Added `resolveTestExecutionTarget` to `execution-target.ts` for remote
environment test resolution with cwd fallback
- Moved the "Test Environment" button and its feedback display into the
`NewAgent` page footer for better UX flow

## Verification

- `pnpm test` — all existing and new tests pass
- `pnpm typecheck` — clean
- Manual: navigate to Company Settings, confirm "Environments" appears
as a top-level section
- Manual: configure an agent with a non-local environment, click "Test
Environment", confirm the test runs inside that environment

## Risks

- Low risk. UI-only routing change for the settings page. The
test-in-environment change adds an optional parameter with a local
fallback, so existing behavior is preserved when no environment is
specified.

## Model Used

Codex GPT 5.4 high via Paperclip.

## Checklist

- [x] I have included a thinking path that traces from project context
to this change
- [x] I have specified the model used (with version and capability
details)
- [x] I have checked ROADMAP.md and confirmed this PR does not duplicate
planned core work
- [x] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [x] If this change affects the UI, I have included before/after
screenshots
- [x] I have updated relevant documentation to reflect my changes
- [x] I have considered and documented any risks above
- [x] I will address all Greptile and reviewer comments before
requesting merge

packages/adapters/gemini-local/src/server/test.ts

@@ -9,12 +9,16 @@ import {
   asNumber,
   asString,
   asStringArray,
-  ensureAbsoluteDirectory,
-  ensureCommandResolvable,
   ensurePathInEnv,
   parseObject,
-  runChildProcess,
 } from "@paperclipai/adapter-utils/server-utils";
+import {
+  ensureAdapterExecutionTargetCommandResolvable,
+  ensureAdapterExecutionTargetDirectory,
+  runAdapterExecutionTargetProcess,
+  describeAdapterExecutionTarget,
+  resolveAdapterExecutionTargetCwd,
+} from "@paperclipai/adapter-utils/execution-target";
 import { DEFAULT_GEMINI_LOCAL_MODEL } from "../index.js";
 import { detectGeminiAuthRequired, detectGeminiQuotaExhausted, parseGeminiJsonl } from "./parse.js";
 import { firstNonEmptyLine } from "./utils.js";
@@ -48,10 +52,28 @@ export async function testEnvironment(
   const checks: AdapterEnvironmentCheck[] = [];
   const config = parseObject(ctx.config);
   const command = asString(config.command, "gemini");
-  const cwd = asString(config.cwd, process.cwd());
+  const target = ctx.executionTarget ?? null;
+  const targetIsRemote = target?.kind === "remote";
+  const cwd = resolveAdapterExecutionTargetCwd(target, asString(config.cwd, ""), process.cwd());
+  const targetLabel = targetIsRemote
+    ? ctx.environmentName ?? describeAdapterExecutionTarget(target) ?? "remote environment"
+    : null;
+  const runId = `gemini-envtest-${Date.now()}-${Math.random().toString(16).slice(2)}`;
+
+  if (targetLabel) {
+    checks.push({
+      code: "gemini_environment_target",
+      level: "info",
+      message: `Probing inside environment: ${targetLabel}`,
+    });
+  }
 
   try {
-    await ensureAbsoluteDirectory(cwd, { createIfMissing: true });
+    await ensureAdapterExecutionTargetDirectory(runId, target, cwd, {
+      cwd,
+      env: {},
+      createIfMissing: true,
+    });
     checks.push({
       code: "gemini_cwd_valid",
       level: "info",
@@ -73,7 +95,7 @@ export async function testEnvironment(
   }
   const runtimeEnv = ensurePathInEnv({ ...process.env, ...env });
   try {
-    await ensureCommandResolvable(command, cwd, runtimeEnv);
+    await ensureAdapterExecutionTargetCommandResolvable(command, target, cwd, runtimeEnv);
     checks.push({
       code: "gemini_command_resolvable",
       level: "info",
@@ -89,10 +111,10 @@ export async function testEnvironment(
   }
 
   const configGeminiApiKey = env.GEMINI_API_KEY;
-  const hostGeminiApiKey = process.env.GEMINI_API_KEY;
+  const hostGeminiApiKey = targetIsRemote ? undefined : process.env.GEMINI_API_KEY;
   const configGoogleApiKey = env.GOOGLE_API_KEY;
-  const hostGoogleApiKey = process.env.GOOGLE_API_KEY;
-  const hasGca = env.GOOGLE_GENAI_USE_GCA === "true" || process.env.GOOGLE_GENAI_USE_GCA === "true";
+  const hostGoogleApiKey = targetIsRemote ? undefined : process.env.GOOGLE_API_KEY;
+  const hasGca = env.GOOGLE_GENAI_USE_GCA === "true" || (!targetIsRemote && process.env.GOOGLE_GENAI_USE_GCA === "true");
   if (
     isNonEmpty(configGeminiApiKey) ||
     isNonEmpty(hostGeminiApiKey) ||
@@ -152,8 +174,9 @@ export async function testEnvironment(
       }
       if (extraArgs.length > 0) args.push(...extraArgs);
 
-      const probe = await runChildProcess(
-        `gemini-envtest-${Date.now()}-${Math.random().toString(16).slice(2)}`,
+      const probe = await runAdapterExecutionTargetProcess(
+        runId,
+        target,
         command,
         args,
         {