chore(catalog): add OpenCode Free ACP provider

plugin-catalog/opencode-free-acp.yaml

@@ -0,0 +1,41 @@
+name: opencode-free-acp
+title: OpenCode Free (ACP)
+repo: https://github.com/cryptobredda/hermes-opencode-free-acp
+sha: edc25305e325754b450e41daf41c6ba5c028324f
+version: "0.3.0"
+requires_hermes: ">=0.22.2"
+maintainer: cryptobredda
+tier: community
+category: models
+platforms: [linux]
+docs_url: https://github.com/cryptobredda/hermes-opencode-free-acp#readme
+readme: true
+description: >-
+  Real OpenCode CLI over ACP as a Hermes model provider, with curated free-model
+  selection and Hermes-owned tool execution and approvals. Independent stdlib
+  transport using only the documented provider API, not an HTTP compatibility
+  client or a handoff to OpenCode's autonomous tools. Disclosure — starts the
+  separately installed opencode acp executable for discovery/inference in the
+  included restricted workspace; forwards the conversation, tool schemas and
+  results to OpenCode and its selected upstream model. The CLI uses its normal
+  HOME/configuration/login and may load user-configured vendor plugins/hooks;
+  its normal network calls, local records and vendor terms apply. Child
+  environment is allowlisted; Hermes/provider keys and YOLO settings are not
+  inherited. Plugin code reads no credential stores, writes no runtime state,
+  makes no direct network calls, installs no binaries and sends no telemetry.
+  Native ACP permission/file/terminal requests are refused, native tool events
+  abort the request, and selection must be confirmed before inference. This is
+  not an OS sandbox or an authorization to use OpenCode; broader vendor policies
+  can override workspace restrictions, and free availability/pricing/privacy
+  can change.
+known_issues:
+  - Requires a separately installed OpenCode v2 CLI; live-tested with OpenCode 2.1.2 on Linux.
+  - Requires plugins.isolation=in_process; isolated plugin-host execution is not supported.
+  - Text and Hermes tools only; output is buffered, and token/cost usage is unknown.
+  - Existing Hermes auxiliary and fallback overrides keep their configured billing behavior.
+  - Offline CI passes on Linux, macOS and Windows, but live CLI/model verification is Linux-only.
+capabilities:
+  provides_tools: []
+  provides_hooks: []
+  provides_middleware: []
+  requires_env: []