docs: improve install discoverability and recommend pipx/uv (#8)

## Summary
- Lead install instructions with `pipx`/`uv tool install` instead of
bare `pip` — avoids `externally-managed-environment` errors on modern
macOS/Linux
- Add explicit callout that `dremio-client` is an unrelated package
(LLMs were installing it instead of `dremio-cli`)
- Update PyPI description and keywords for better LLM/search
discoverability

## Context
A non-dev user asked Claude Code to "find the dremio CLI and install
it." Claude found `dremio-client` (wrong package), hit the
externally-managed-environment error, struggled with PATH, then hit
missing deps in the wrong package. None of these are bugs in
`dremio-cli`, but we can prevent the confusion with better docs and
metadata.

## Test plan
- [ ] Verify README renders correctly on GitHub
- [ ] Verify `pipx install dremio-cli` works on a clean macOS machine
- [ ] Check PyPI description after next release shows the updated text

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: aniket-s-kulkarni

README.md

@@ -32,13 +32,18 @@ Dremio Cloud has a powerful REST API and rich system tables, but no official CLI
 
 ### 1. Install
 
+The package name is **`dremio-cli`** (not `dremio-client`, which is an unrelated third-party package).
+
 ```bash
-# Install from PyPI (recommended)
-pip install dremio-cli
+# Recommended — isolated install, no venv needed
+pipx install dremio-cli
 
-# Or with uv
+# Or with uv (fast, also isolated)
 uv tool install dremio-cli
 
+# Or with pip (requires a virtual environment on modern Python)
+pip install dremio-cli
+
 # Or install from source
 git clone https://github.com/dremio/cli.git
 cd cli
@@ -48,6 +53,10 @@ uv tool install .
 uv sync
 ```
 
+> **Tip:** On macOS and recent Linux distros, `pip install` into the system Python is blocked
+> (`externally-managed-environment` error). Use `pipx` or `uv tool install` instead — they
+> automatically create an isolated environment for you.
+
 After install, verify the binary is available:
 
 ```bash

pyproject.toml

@@ -1,7 +1,7 @@
 [project]
 name = "dremio-cli"
 dynamic = ["version"]
-description = "Developer CLI for Dremio Cloud"
+description = "Official developer CLI for Dremio Cloud — install with: pipx install dremio-cli"
 readme = "README.md"
 requires-python = ">=3.11"
 license = "Apache-2.0"
@@ -17,7 +17,7 @@ classifiers = [
     "Programming Language :: Python :: 3.13",
     "Topic :: Database",
 ]
-keywords = ["dremio", "cli", "data-lake", "sql"]
+keywords = ["dremio", "dremio-cloud", "cli", "data-lake", "sql", "official"]
 dependencies = [
     "typer>=0.9",
     "httpx>=0.27",