Add built-in grok_local adapter (#6087)

## Thinking Path

> - Paperclip orchestrates AI agents for zero-human companies, so
adapter quality directly affects what runtimes the control plane can
supervise.
> - Local CLI adapters are one of the core execution surfaces because
they turn real coding tools into Paperclip-managed employees with
heartbeats, transcripts, and reviewability.
> - Grok Build was installed on the Paperclip host, but Paperclip had no
built-in `grok_local` adapter, so the runtime could not be configured
through the normal server/UI/CLI adapter path.
> - That gap needed to be closed with the same built-in registry,
environment diagnostics, transcript parsing, and skill/instructions
behavior that the other local adapters already rely on.
> - After the initial adapter landed, a real follow-up run showed that
Grok streaming text was being rendered one fragment per line, which made
transcripts harder to read even though the runtime itself was working.
> - This pull request adds the built-in `grok_local` adapter end-to-end
and then fixes the transcript parser so streamed Grok output is
coalesced into readable assistant/thinking blocks.
> - The benefit is that Grok Build becomes a first-class Paperclip
runtime with a usable operator experience instead of a partially wired
runtime with noisy transcript output.

## What Changed

- Added a new built-in `@paperclipai/adapter-grok-local` package with
server, UI, and CLI entrypoints.
- Implemented Grok execution, session handling, environment diagnostics,
config building, skill syncing, and parser coverage inside the new
adapter package.
- Registered `grok_local` across the built-in adapter inventories and
capability/display metadata in server, UI, CLI, and shared constants.
- Added adapter route coverage for the new built-in type.
- Fixed Grok transcript readability by emitting streamed `text` and
`thought` fragments as deltas so the shared transcript builder coalesces
them into readable message blocks.
- Added regression tests for the Grok parser and transcript coalescing
behavior.

## Verification

- `pnpm vitest run
packages/adapters/grok-local/src/ui/parse-stdout.test.ts
ui/src/adapters/transcript.test.ts`
- `pnpm --filter @paperclipai/adapter-grok-local build`
- Manual runtime verification on the Paperclip host during
implementation and follow-up review:
  - confirmed the Grok CLI was installed and authenticated
- confirmed the worktree dev server could be restarted cleanly and
health-checked after the parser follow-up
- No screenshots attached. This change is primarily adapter plumbing
plus transcript formatting behavior; reviewers can verify via the
Grok-backed run surfaces directly.

## Risks

- This adds a new built-in adapter, so any missed registration surface
could create inconsistencies between server, UI, and CLI behavior.
- The adapter depends on Grok Build's current event/output shape; if
upstream Grok streaming JSON changes, transcript parsing or session
extraction may need follow-up updates.
- The transcript readability fix intentionally changes how Grok
fragments are grouped, so any downstream code that implicitly expected
one entry per fragment would behave differently.

> For core feature work, check [`ROADMAP.md`](ROADMAP.md) first and
discuss it in `#dev` before opening the PR. Feature PRs that overlap
with planned core work may need to be redirected — check the roadmap
first. See `CONTRIBUTING.md`.

## Model Used

- OpenAI Codex via Paperclip `codex_local` agent runtime.
- GPT-5-class coding model with tool use, shell execution, file editing,
and repo inspection enabled.
- Exact backend model ID/context window were not surfaced to the agent
in this Paperclip session.

## Checklist

- [x] I have included a thinking path that traces from project context
to this change
- [x] I have specified the model used (with version and capability
details)
- [x] I have checked ROADMAP.md and confirmed this PR does not duplicate
planned core work
- [x] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [ ] If this change affects the UI, I have included before/after
screenshots
- [ ] I have updated relevant documentation to reflect my changes
- [x] I have considered and documented any risks above
- [x] I will address all Greptile and reviewer comments before
requesting merge

packages/adapters/grok-local/src/server/skills.ts

@@ -0,0 +1,80 @@
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import type {
+  AdapterSkillContext,
+  AdapterSkillEntry,
+  AdapterSkillSnapshot,
+} from "@paperclipai/adapter-utils";
+import {
+  readPaperclipRuntimeSkillEntries,
+  resolvePaperclipDesiredSkillNames,
+} from "@paperclipai/adapter-utils/server-utils";
+
+const __moduleDir = path.dirname(fileURLToPath(import.meta.url));
+
+async function buildGrokSkillSnapshot(
+  config: Record<string, unknown>,
+): Promise<AdapterSkillSnapshot> {
+  const availableEntries = await readPaperclipRuntimeSkillEntries(config, __moduleDir);
+  const availableByKey = new Map(availableEntries.map((entry) => [entry.key, entry]));
+  const desiredSkills = resolvePaperclipDesiredSkillNames(config, availableEntries);
+  const desiredSet = new Set(desiredSkills);
+  const entries: AdapterSkillEntry[] = availableEntries.map((entry) => ({
+    key: entry.key,
+    runtimeName: entry.runtimeName,
+    desired: desiredSet.has(entry.key),
+    managed: true,
+    state: desiredSet.has(entry.key) ? "configured" : "available",
+    origin: entry.required ? "paperclip_required" : "company_managed",
+    originLabel: entry.required ? "Required by Paperclip" : "Managed by Paperclip",
+    readOnly: false,
+    sourcePath: entry.source,
+    targetPath: null,
+    detail: desiredSet.has(entry.key)
+      ? "Will be copied into `.claude/skills` in the execution workspace on the next run."
+      : null,
+    required: Boolean(entry.required),
+    requiredReason: entry.requiredReason ?? null,
+  }));
+  const warnings: string[] = [];
+
+  for (const desiredSkill of desiredSkills) {
+    if (availableByKey.has(desiredSkill)) continue;
+    warnings.push(`Desired skill "${desiredSkill}" is not available from the Paperclip skills directory.`);
+    entries.push({
+      key: desiredSkill,
+      runtimeName: null,
+      desired: true,
+      managed: true,
+      state: "missing",
+      origin: "external_unknown",
+      originLabel: "External or unavailable",
+      readOnly: false,
+      sourcePath: null,
+      targetPath: null,
+      detail: "Paperclip cannot find this skill in the local runtime skills directory.",
+    });
+  }
+
+  entries.sort((left, right) => left.key.localeCompare(right.key));
+
+  return {
+    adapterType: "grok_local",
+    supported: true,
+    mode: "ephemeral",
+    desiredSkills,
+    entries,
+    warnings,
+  };
+}
+
+export async function listGrokSkills(ctx: AdapterSkillContext): Promise<AdapterSkillSnapshot> {
+  return buildGrokSkillSnapshot(ctx.config);
+}
+
+export async function syncGrokSkills(
+  ctx: AdapterSkillContext,
+  _desiredSkills: string[],
+): Promise<AdapterSkillSnapshot> {
+  return buildGrokSkillSnapshot(ctx.config);
+}