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feat(architecture): [EoS/opencode] Migrate OpenCode onto the Embeddable Orchestration System (ADR-1239, #2087)

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Route OpenCode (and its Kilo sibling) through the public Host-Integration Interface and
land two Context7-verified capability upgrades. Byte-identical install output for all 16
runtimes (golden parity asserted).

Through the interface (AC2):
- OpenCode/Kilo's bespoke commands+skills+plugin install (the inline
  `else if (isOpencode || isKilo)` block) moves into the engine
  (installOpencodeFamilyCommands/Artifacts in src/install-engine.cts), dispatched by
  installRuntimeArtifacts when the descriptor declares hostBehaviors.combinedFamilyInstall.
  opencode/kilo now flow CLI -> _runtimeAdapter -> installRuntimeArtifacts like the skills
  runtimes. _isSkillsRuntime no longer excludes them; the bespoke block + dead
  copyFlattenedCommands are removed.
- Every hardcoded `runtime === 'opencode'`/`isOpencode` branch is folded into
  descriptor-driven runtime.hostBehaviors. ZERO `runtime === 'opencode'`/`'kilo'`
  string-equality remain in bin/install.js / install-engine.cts / runtime-artifact-conversion.cts.

Upgrades (AC4):
- Background dispatch: OpenCode shipped experimental background subagents in v1.15 and
  made them default-on in v1.17 -> dispatch.background/backgroundDispatch flip to true;
  shouldFlattenDispatch(opencode) now returns false (behavioral change; type: Changed).
- Expanded event surface: the OpenCode plugin subscribes permission.asked/replied +
  session.error.

Tests: opencode-imperative-reference (adapter/profile, shouldFlattenDispatch pin,
fail-closed negotiate, hostBehaviors, AC2 source-guard) + extended plugin surface test.
Docs: capability matrix v1.15/v1.17 citations. Changeset (Changed). gitignore .memdb//.memtrace/.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Tom Boucher
2026-07-08 16:53:54 -04:00
parent ab78797ac5
commit 396f44bd0b
16 changed files with 450 additions and 155 deletions
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type: Changed
pr: 2087
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**OpenCode is now driven through the public Host-Integration Interface, with two capability upgrades (ADR-1239 / EoS).** OpenCode and its Kilo sibling previously installed via a bespoke `runtime === 'opencode'`/`isOpencode` branch in `bin/install.js`; its commands+skills+plugin install now runs through the imperative adapter → the engine's combined-family install path (`installRuntimeArtifacts`), and every hardcoded `runtime === 'opencode'` branch is folded into descriptor-driven `runtime.hostBehaviors`. Install/uninstall output is **byte-identical** (golden parity asserted for all 16 runtimes). Two Context7-verified upgrades land: (1) **background dispatch** — OpenCode shipped experimental background subagents in v1.15 and made them default-on in v1.17, so `dispatch.background`/`backgroundDispatch` flip to `true`; GSD no longer force-flattens OpenCode-hosted wave dispatch (`shouldFlattenDispatch` now returns `false`), letting agents run concurrently where the host supports it. (2) **expanded event surface** — the OpenCode plugin now subscribes to `permission.asked`, `permission.replied`, and `session.error` (added to `EXTENSION_EVENT_SURFACES.opencode`), wiring the declared surface for future permission/error-aware bindings. (#2087)