feat(adapters): add Gemini CLI local adapter support

Signed-off-by: Aditya Sasidhar <telikicherlaadityasasidhar@gmail.com>

docs/adapters/gemini-local.md

@@ -0,0 +1,45 @@
+---
+title: Gemini Local
+summary: Gemini CLI local adapter setup and configuration
+---
+
+The `gemini_local` adapter runs Google's Gemini CLI locally. It supports session persistence with `--resume`, skills injection, and structured `stream-json` output parsing.
+
+## Prerequisites
+
+- Gemini CLI installed (`gemini` command available)
+- `GEMINI_API_KEY` or `GOOGLE_API_KEY` set, or local Gemini CLI auth configured
+
+## Configuration Fields
+
+| Field | Type | Required | Description |
+|-------|------|----------|-------------|
+| `cwd` | string | Yes | Working directory for the agent process (absolute path; created automatically if missing when permissions allow) |
+| `model` | string | No | Gemini model to use. Defaults to `auto`. |
+| `promptTemplate` | string | No | Prompt used for all runs |
+| `instructionsFilePath` | string | No | Markdown instructions file prepended to the prompt |
+| `env` | object | No | Environment variables (supports secret refs) |
+| `timeoutSec` | number | No | Process timeout (0 = no timeout) |
+| `graceSec` | number | No | Grace period before force-kill |
+| `yolo` | boolean | No | Pass `--approval-mode yolo` for unattended operation |
+
+## Session Persistence
+
+The adapter persists Gemini session IDs between heartbeats. On the next wake, it resumes the existing conversation with `--resume` so the agent retains context.
+
+Session resume is cwd-aware: if the working directory changed since the last run, a fresh session starts instead.
+
+If resume fails with an unknown session error, the adapter automatically retries with a fresh session.
+
+## Skills Injection
+
+The adapter symlinks Paperclip skills into the Gemini global skills directory (`~/.gemini/skills`). Existing user skills are not overwritten.
+
+## Environment Test
+
+Use the "Test Environment" button in the UI to validate the adapter config. It checks:
+
+- Gemini CLI is installed and accessible
+- Working directory is absolute and available (auto-created if missing and permitted)
+- API key/auth hints (`GEMINI_API_KEY` or `GOOGLE_API_KEY`)
+- A live hello probe (`gemini --output-format json "Respond with hello."`) to verify CLI readiness