chore(openspec): archive completed changes

- Archive config-secrets (FN-009) - 31 tasks complete
- Archive runfusion-poc (FN-008) - 25 tasks complete
- Archive deployment-config (FN-006) - 27 tasks complete
- All changes moved to openspec/changes/archive/

openspec/changes/archive/2026-05-14-runfusion-poc/specs/executable-environment/spec.md

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+## ADDED Requirements
+
+### Requirement: Container provides web terminal interface
+The system SHALL provide a web terminal interface in the OpenCode container.
+
+#### Scenario: Terminal available
+- **WHEN** the OpenCode container is running
+- **THEN** a web terminal is accessible via HTTP on port 3000
+- **AND** the user can execute shell commands through the browser
+
+#### Scenario: Workspace access
+- **WHEN** the container runs
+- **THEN** the project workspace is mounted at /workspace
+- **AND** the user can read/write files in the workspace
+
+### Requirement: Container supports AI features
+The system SHALL allow AI-powered development features in the OpenCode environment.
+
+#### Scenario: AI assistance
+- **WHEN** the user interacts with OpenCode
+- **THEN** AI features are available for code completion and assistance
+- **AND** the user can configure AI provider settings
+
+#### Scenario: Terminal session persistence
+- **WHEN** the user opens a terminal session
+- **THEN** the session persists while the container runs
+- **AND** multiple sessions can be opened