Restore CONTEXT.md and its test

CONTEXT.md serves as injected agent context, distinct from the
human-facing README. Restoring after accidental deletion.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: jarrodwatts

CONTEXT.md

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+# AGW Context
+
+AGW is an agent-first CLI for Abstract Global Wallet workflows. Treat the CLI as the source of truth.
+
+## Rules
+
+- Use `agw-cli schema <commandId>` whenever the request or response shape is unclear.
+- Pass command input with `--json <payload|@file>`.
+- Keep runtime config out of JSON payloads. Use `AGW_*` env vars or CLI flags such as `--home`, `--chain-id`, `--rpc-url`, and `--app-url`.
+- Treat signing and state-changing commands as preview-first.
+- Use `--dry-run` to validate locally and inspect the preview.
+- Use `--execute` only after explicit user confirmation.
+- Never infer execute permission from a successful preview.
+- Keep reads narrow with `fields`.
+- Use pagination on list surfaces and prefer `--page-all --output ndjson` for large result sets.
+- Parse stdout only. Diagnostics and warnings belong on stderr.
+- Prefer MCP when the host supports it. The MCP server is generated from the same registry as the CLI.
+- Sanitization profiles are `off` and `strict`. MCP and extension surfaces default to `strict`.
+
+## Config
+
+Public runtime config is:
+
+- `AGW_HOME`
+- `AGW_CHAIN_ID`
+- `AGW_RPC_URL`
+- `AGW_APP_URL`
+- `AGW_OUTPUT`
+- `AGW_CALLBACK_SIGNING_PUBLIC_KEY`
+- `AGW_CALLBACK_SIGNING_ISSUER`
+- `AGW_SANITIZE_PROFILE`
+
+## Common Patterns
+
+Inspect schema:
+
+```bash
+agw-cli schema tx.send
+```
+
+Inspect session state:
+
+```bash
+agw-cli session status --json '{"fields":["status","readiness","accountAddress"]}'
+```
+
+Preview a mutating action:
+
+```bash
+agw-cli tx send --json '{"to":"0x...","data":"0x1234","value":"0"}' --dry-run
+```
+
+Execute after confirmation:
+
+```bash
+agw-cli tx send --json '{"to":"0x...","data":"0x1234","value":"0"}' --execute
+```
+
+Stream a paginated read:
+
+```bash
+agw-cli wallet tokens list \
+  --json '{"pageSize":25,"fields":["items.symbol","items.value","nextCursor"]}' \
+  --page-all \
+  --output ndjson
+```