docs(openspec): add OpenSpec changes for FN-005, FN-006, FN-008, FN-009, FN-010

- Add frontend-foundation change (FN-005) with 46 tasks
- Add deployment-config change (FN-006) with 27 tasks
- Add runfusion-poc/opencode-poc change (FN-008) with 25 tasks
- Add config-secrets change (FN-009) with 31 tasks
- Add codeserver-spawn change (FN-010) with 38 tasks
- Include project specsheet and configuration
- Archive completed deployment-config change

openspec/changes/archive/2026-05-14-codeserver-spawn/specs/codeserver-manifest/spec.md

@@ -0,0 +1,23 @@
+## ADDED Requirements
+
+### Requirement: code-server manifest defines runtime configuration
+The system SHALL provide a complete code-server manifest.
+
+#### Scenario: Manifest includes Docker configuration
+- **WHEN** the code-server manifest is loaded
+- **THEN** it specifies the Docker image (codercom/code-server)
+- **AND** it defines exposed ports (8080)
+- **AND** it defines volume mounts (workspace, config, ssh)
+
+#### Scenario: Manifest includes environment variables
+- **WHEN** the manifest is used for spawning
+- **THEN** it defines required environment variables
+- **AND** it defines optional config overrides
+
+### Requirement: code-server manifest is valid
+The system SHALL validate the code-server manifest against the tool manifest schema.
+
+#### Scenario: Schema validation
+- **WHEN** the manifest is loaded at startup
+- **THEN** it passes schema validation
+- **AND** any errors prevent application startup