Merge branch 'next' into fix/2056-plan-phase-foreign-prefix

.changeset/2073-antigravity-reviewer-block.md

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+---
+type: Fixed
+pr: 2109
+---
+**`/gsd-review`'s Antigravity CLI reviewer no longer fails silently on large prompts, unavailable pinned models, or pre-session stalls** — the `agy` invocation now uses a file-reference prompt to avoid exec arg-list overflow, is wrapped in an external wall-clock `timeout` paired with `--print-timeout` because `--print-timeout` cannot fire before `agy` creates a session, passes `--model` from `review.models.agy` when set as an escape hatch for a 404'd pinned model, and its empty-output stub now surfaces an `agy` cli.log diagnostic instead of a bare generic message. Supersedes the #687 "no external killer / inline `$(cat)`" contract, which predated `agy` gaining `--model` and predated its own guidance to pair `--print-timeout` with a terminal timeout. (#2073)

.changeset/2086-eos-claude-imperative-adapter.md

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+---
+type: Changed
+pr: 2106
+---
+**Internal: Claude Code's installer is now driven through the public Host-Integration Interface (ADR-1239 / EoS).** `bin/install.js` routes `claude` install/uninstall through the imperative adapter (`createImperativeAdapter`) instead of calling the engine directly, and its 13 hardcoded `runtime === 'claude'` / `runtime !== 'claude'` branches are folded into descriptor-driven `runtime.hostBehaviors` on `capabilities/claude/capability.json` (permission schema, `settings.local.json` scope routing, `.gsd-source` marker, effort frontmatter, canonical-workflow authorship, and more). Install/uninstall output is **byte-identical** for both the global skills layout and the local legacy layout (golden-parity asserted for both scopes); no other runtime changes. Removes the "add-a-host tax" of scattered string-equality checks for the tier-1 reference host. No user-facing change. (#2086)

.changeset/2087-eos-opencode-imperative-adapter.md

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+---
+type: Changed
+pr: 2108
+---
+**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)

.changeset/2088-eos-codex-declarative-adapter.md

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+---
+type: Changed
+pr: 2110
+---
+**Codex is now driven through the public Host-Integration Interface, with three capability upgrades (ADR-1239 / EoS).** Codex previously installed via hardcoded `runtime === 'codex'`/`isCodex` projection in `bin/install.js`; its `config.toml` / agent-`.toml` / `hooks.json` install now runs through the declarative embedding adapter and descriptor-driven `runtime.hostBehaviors`, with **zero** positive `isCodex` gates and **zero** `runtime === 'codex'` branches remaining (source-guarded). Install/uninstall output stays byte-parity-gated (`tests/fixtures/golden-install-parity/codex.json`). Three Context7-verified upgrades land, each with a test driving the user-reachable surface: (1) **skill root** — GSD skills now install to Codex's canonical `$HOME/.agents/skills` (via a skills-kind `home` override) instead of the deprecated `$CODEX_HOME/skills` fallback, and pre-move installs are migrated (stale `~/.codex/skills/gsd-*` cleaned on both install and uninstall, user-owned content preserved); (2) **hook events** — GSD registers the six documented Codex lifecycle events it previously skipped (`PreToolUse`, `PermissionRequest`, `PreCompact`, `PostCompact`, `SubagentStop`, `UserPromptSubmit`, in addition to the existing `SessionStart`/`SubagentStart`/`Stop`/`PostToolUse`) in `hooks.json`, so `gsd-context-monitor` fires at the same points as in Claude Code, and the descriptor `extendedHookEvents` is reconciled from `[]` to the schema-valid wired subset; (3) **dispatch tuning** — `[agents] max_depth = 1` is written explicitly into the managed `config.toml` block to pin the negotiated `dispatch.maxDepth: 1` axis (`degradationFor` flattens GSD-hosted waves to single-level), and `validateCodexConfigSchema` now permits a known-scalar-only `[agents]` AgentsToml table (coexisting with the flattened `[agents.gsd-*]` role sub-tables) while still rejecting the `[[agents]]` and unknown-key break-forms from #2760. (#2088)

.changeset/2089-eos-cursor-imperative-adapter.md

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+---
+type: Changed
+pr: 2120
+---
+**Cursor is now driven through the public Host-Integration Interface, with two capability upgrades (ADR-1239 / EoS).** Cursor previously installed via hardcoded `runtime === 'cursor'`/`isCursor` branches in `bin/install.js`; its install/uninstall now runs through the imperative adapter, and every hardcoded cursor branch is folded into descriptor-driven `runtime.hostBehaviors` (reapplyCommand, frontmatterDialect, hooksJsonSurface, skipSharedHooksInstall, reportCommandsDir, managedHookEvents). Install/uninstall output is **byte-identical** (golden parity asserted for all 16 runtimes). Two Context7-verified upgrades land: (1) **expanded hook-bus coverage** — GSD registers all 6 managed lifecycle events in Cursor's `hooks.json` (`preToolUse`, `stop`, `subagentStart`, `subagentStop` in addition to the original `sessionStart`/`postToolUse`), driven by a new descriptor-driven adapter module (`src/host-integration-adapters/imperative-hook-bus.cts`) that reads `hostBehaviors.managedHookEvents` instead of a hardcoded event pair; cite https://cursor.com/docs/hooks. (2) **named/background nested subagent dispatch** — Cursor's `dispatch.background`/`backgroundDispatch`/`nested` are all `true` with `maxDepth: 2`, so `shouldFlattenDispatch(cursor)` returns `false` and GSD's wave-based execution drives Cursor's native background + depth-2 nested subagent invocation instead of flattening to inline sequential calls; cite https://cursor.com/docs/subagents + https://cursor.com/docs/sdk/typescript. (#2089)