feat(opencode): add Terra execution subagent

Makefile

@@ -1,4 +1,4 @@
-.PHONY: changed-charts list-charts list-charts-json package-chart test
+.PHONY: changed-charts list-charts list-charts-json package-chart test test-opencode-server-agents
 
 SHELL := /bin/bash
 CHARTS := $(shell find . -maxdepth 2 -name Chart.yaml -printf '%h\n' | cut -d'/' -f2 | sort -u)
@@ -19,3 +19,25 @@ package-chart:
 
 test:
 	@for chart in $(CHARTS); do helm lint --strict "$$chart" && helm template test "$$chart" > /dev/null; done
+	@$(MAKE) test-opencode-server-agents
+
+test-opencode-server-agents:
+	@set -euo pipefail; \
+	expected="$$(printf '%s\n' '---' "description: Use for bounded generic coding, debugging, or repository tasks when the assigning primary agent's execution budget is nearing completion or it otherwise needs execution capacity; the primary retains task interpretation, safety, delivery decisions, and final synthesis" 'mode: subagent' 'model: openai/gpt-5.6-terra' 'variant: default' '---')"; \
+	test "$$(cat opencode-server/files/agents/terra.md)" = "$$expected"; \
+	grep -Fqx 'version: 0.2.0' opencode-server/Chart.yaml; \
+	grep -Fqx '  "default_agent": "default",' opencode-server/files/opencode.json; \
+	rendered="$$(helm template test opencode-server)"; \
+	echo "$$rendered" | grep -Fqx '  terra.md: |-'; \
+	echo "$$rendered" | grep -Fqx "    description: Use for bounded generic coding, debugging, or repository tasks when the assigning primary agent's execution budget is nearing completion or it otherwise needs execution capacity; the primary retains task interpretation, safety, delivery decisions, and final synthesis"; \
+	echo "$$rendered" | grep -Fqx '    mode: subagent'; \
+	echo "$$rendered" | grep -Fqx '    model: openai/gpt-5.6-terra'; \
+	echo "$$rendered" | grep -Fqx '    variant: default'; \
+	echo "$$rendered" | grep -Fqx '              - key: terra.md'; \
+	echo "$$rendered" | grep -Fqx '                path: agents/terra.md'; \
+	archive_dir="$$(mktemp -d)"; \
+	trap 'rm -rf "$$archive_dir"' EXIT; \
+	helm package opencode-server --destination "$$archive_dir" > /dev/null; \
+	archive="$$(find "$$archive_dir" -maxdepth 1 -type f -name 'opencode-server-0.2.0.tgz' -print -quit)"; \
+	test -n "$$archive"; \
+	tar -tzf "$$archive" | grep -Fqx 'opencode-server/files/agents/terra.md'

opencode-server/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v2
 name: opencode-server
 description: OpenCode server Deployment and non-secret configuration
-version: 0.1.78
+version: 0.2.0
 appVersion: "1.18.29"
 type: application

opencode-server/README.md

@@ -14,7 +14,7 @@ The chart copies these immutable package inputs into `/home/opencode/.config/ope
 
 - `files/opencode.json` — providers, enabled MCP integrations, default agent, and global OpenCode configuration
 - `files/AGENTS.md` — shared instructions loaded by every agent
-- `files/agents/*.md` — owner-specific primary agents, model-backed subagents for delegated passes, and specialized read-only SDLC subagents (adversarial code review, QA coverage and documentation adequacy, release readiness, infrastructure security, documentation drafting)
+- `files/agents/*.md` — owner-specific primary agents, the generic `terra` execution subagent, model-backed subagents for delegated passes, and specialized read-only SDLC subagents (adversarial code review, QA coverage and documentation adequacy, release readiness, infrastructure security, documentation drafting)
 - `files/skills/*/SKILL.md` — specialized operational workflows
 
 A change to any packaged file is chart content and requires a new `Chart.yaml` version. See [Agent instruction architecture](docs/agent-instruction-architecture.md) for the primary-agent, subagent, and shared-instruction design.

opencode-server/docs/agent-instruction-architecture.md

@@ -85,6 +85,14 @@ interpretation, architecture, safety, cross-repository impact, mutation
 authorization, and final synthesis; it verifies material findings. Independent
 scopes may run in parallel.
 
+[`files/agents/terra.md`](../files/agents/terra.md) defines `terra`, a
+full-capability, generic execution subagent using `openai/gpt-5.6-terra` with
+the default variant. A primary may select it for bounded coding, debugging, or
+repository tasks when it needs execution capacity. It does not change the
+`default` primary-agent selection or delegate primary ownership; the assigning
+primary must supply authority, scope, safety constraints, and completion
+criteria in the task prompt.
+
 The repository-capable `kimi` and `kimi-256k` subagents include a compact,
 self-contained `codebase-memory` and GitHub routing rule because they may
 perform bounded repository passes. Other subagents receive their authoritative sources,

opencode-server/files/agents/terra.md

@@ -0,0 +1,6 @@
+---
+description: Use for bounded generic coding, debugging, or repository tasks when the assigning primary agent's execution budget is nearing completion or it otherwise needs execution capacity; the primary retains task interpretation, safety, delivery decisions, and final synthesis
+mode: subagent
+model: openai/gpt-5.6-terra
+variant: default
+---