Add SSH environment support (#4358)

## Thinking Path

> - Paperclip orchestrates AI agents for zero-human companies
> - The environments subsystem already models execution environments,
but before this branch there was no end-to-end SSH-backed runtime path
for agents to actually run work against a remote box
> - That meant agents could be configured around environment concepts
without a reliable way to execute adapter sessions remotely, sync
workspace state, and preserve run context across supported adapters
> - We also need environment selection to participate in normal
Paperclip control-plane behavior: agent defaults, project/issue
selection, route validation, and environment probing
> - Because this capability is still experimental, the UI surface should
be easy to hide and easy to remove later without undoing the underlying
implementation
> - This pull request adds SSH environment execution support across the
runtime, adapters, routes, schema, and tests, then puts the visible
environment-management UI behind an experimental flag
> - The benefit is that we can validate real SSH-backed agent execution
now while keeping the user-facing controls safely gated until the
feature is ready to come out of experimentation

## What Changed

- Added SSH-backed execution target support in the shared adapter
runtime, including remote workspace preparation, skill/runtime asset
sync, remote session handling, and workspace restore behavior after
runs.
- Added SSH execution coverage for supported local adapters, plus remote
execution tests across Claude, Codex, Cursor, Gemini, OpenCode, and Pi.
- Added environment selection and environment-management backend support
needed for SSH execution, including route/service work, validation,
probing, and agent default environment persistence.
- Added CLI support for SSH environment lab verification and updated
related docs/tests.
- Added the `enableEnvironments` experimental flag and gated the
environment UI behind it on company settings, agent configuration, and
project configuration surfaces.

## Verification

- `pnpm exec vitest run
packages/adapters/claude-local/src/server/execute.remote.test.ts
packages/adapters/cursor-local/src/server/execute.remote.test.ts
packages/adapters/gemini-local/src/server/execute.remote.test.ts
packages/adapters/opencode-local/src/server/execute.remote.test.ts
packages/adapters/pi-local/src/server/execute.remote.test.ts`
- `pnpm exec vitest run server/src/__tests__/environment-routes.test.ts`
- `pnpm exec vitest run
server/src/__tests__/instance-settings-routes.test.ts`
- `pnpm exec vitest run ui/src/lib/new-agent-hire-payload.test.ts
ui/src/lib/new-agent-runtime-config.test.ts`
- `pnpm -r typecheck`
- `pnpm build`
- Manual verification on a branch-local dev server:
  - enabled the experimental flag
  - created an SSH environment
  - created a Linux Claude agent using that environment
- confirmed a run executed on the Linux box and synced workspace changes
back

## Risks

- Medium: this touches runtime execution flow across multiple adapters,
so regressions would likely show up in remote session setup, workspace
sync, or environment selection precedence.
- The UI flag reduces exposure, but the underlying runtime and route
changes are still substantial and rely on migration correctness.
- The change set is broad across adapters, control-plane services,
migrations, and UI gating, so review should pay close attention to
environment-selection precedence and remote workspace lifecycle
behavior.

## Model Used

- OpenAI Codex via Paperclip's local Codex adapter, GPT-5-class coding
model with tool use and code execution in the local repo workspace. The
local adapter does not surface a more specific public model version
string in this branch workflow.

## 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
- [ ] 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

server/src/services/execution-workspace-policy.ts

@@ -38,6 +38,7 @@ export function parseProjectExecutionWorkspacePolicy(raw: unknown): ProjectExecu
   const defaultMode = asString(parsed.defaultMode, "");
   const defaultProjectWorkspaceId =
     typeof parsed.defaultProjectWorkspaceId === "string" ? parsed.defaultProjectWorkspaceId : undefined;
+  const environmentId = typeof parsed.environmentId === "string" ? parsed.environmentId : undefined;
   const allowIssueOverride =
     typeof parsed.allowIssueOverride === "boolean" ? parsed.allowIssueOverride : undefined;
   const normalizedDefaultMode = (() => {
@@ -58,6 +59,7 @@ export function parseProjectExecutionWorkspacePolicy(raw: unknown): ProjectExecu
     ...(normalizedDefaultMode ? { defaultMode: normalizedDefaultMode } : {}),
     ...(allowIssueOverride !== undefined ? { allowIssueOverride } : {}),
     ...(defaultProjectWorkspaceId ? { defaultProjectWorkspaceId } : {}),
+    ...(environmentId !== undefined ? { environmentId } : {}),
     ...(workspaceStrategy ? { workspaceStrategy } : {}),
     ...(parsed.workspaceRuntime && typeof parsed.workspaceRuntime === "object" && !Array.isArray(parsed.workspaceRuntime)
       ? { workspaceRuntime: { ...(parsed.workspaceRuntime as Record<string, unknown>) } }
@@ -109,6 +111,7 @@ export function parseIssueExecutionWorkspaceSettings(raw: unknown): IssueExecuti
     ...(normalizedMode
       ? { mode: normalizedMode as IssueExecutionWorkspaceSettings["mode"] }
       : {}),
+    ...(typeof parsed.environmentId === "string" ? { environmentId: parsed.environmentId } : {}),
     ...(workspaceStrategy ? { workspaceStrategy } : {}),
     ...(parsed.workspaceRuntime && typeof parsed.workspaceRuntime === "object" && !Array.isArray(parsed.workspaceRuntime)
       ? { workspaceRuntime: { ...(parsed.workspaceRuntime as Record<string, unknown>) } }
@@ -116,6 +119,28 @@ export function parseIssueExecutionWorkspaceSettings(raw: unknown): IssueExecuti
   };
 }
 
+export function resolveExecutionWorkspaceEnvironmentId(input: {
+  projectPolicy: ProjectExecutionWorkspacePolicy | null;
+  issueSettings: IssueExecutionWorkspaceSettings | null;
+  workspaceConfig: { environmentId?: string | null } | null;
+  agentDefaultEnvironmentId: string | null;
+  defaultEnvironmentId: string;
+}) {
+  if (input.workspaceConfig?.environmentId !== undefined) {
+    return input.workspaceConfig.environmentId ?? input.defaultEnvironmentId;
+  }
+  if (input.issueSettings?.environmentId !== undefined) {
+    return input.issueSettings.environmentId ?? input.defaultEnvironmentId;
+  }
+  if (input.projectPolicy?.environmentId !== undefined) {
+    return input.projectPolicy.environmentId ?? input.defaultEnvironmentId;
+  }
+  if (input.agentDefaultEnvironmentId !== null) {
+    return input.agentDefaultEnvironmentId;
+  }
+  return input.defaultEnvironmentId;
+}
+
 export function defaultIssueExecutionWorkspaceSettingsForProject(
   projectPolicy: ProjectExecutionWorkspacePolicy | null,
 ): IssueExecutionWorkspaceSettings | null {