Revert "docs: update README with pi install instructions and package info"

This reverts commit 8b5e6bc417.

README.md

@@ -4,33 +4,21 @@ Emits a sound alert when the context window reaches or exceeds **100 000 tokens*
 
 ## Installation
 
-### Via `pi install` (recommended)
+### Option 1: Auto-discovered (recommended)
 
 ```bash
-pi install git:git.enne2.net/enne2/context-warn@main
-```
-
-Or pin to a specific tag:
-
-```bash
-pi install git:git.enne2.net/enne2/context-warn@v1.0.0
+mkdir -p ~/.pi/agent/extensions/context-warn
+cp -r /home/enne2/base/context-warn-extension/* ~/.pi/agent/extensions/context-warn/
 ```
 
-### Via `--extension` (test without installing)
-
-```bash
-pi -e git:git.enne2.net/enne2/context-warn
-```
+Then reload pi with `/reload`.
 
-### Manual install
+### Option 2: One-off with --extension
 
 ```bash
-mkdir -p ~/.pi/agent/extensions/context-warn
-cp -r ~/.pi/agent/git/git.enne2.net/enne2/context-warn/* ~/.pi/agent/extensions/context-warn/
+pi -e /home/enne2/base/context-warn-extension/index.ts
 ```
 
-Then reload pi with `/reload`.
-
 ## Features
 
 - **Sound alert**: Plays a pre-bundled WAV alert sound via `aplay` (no runtime generation)
@@ -47,7 +35,7 @@ Then reload pi with `/reload`.
 
 ## Configuration
 
-Edit these values at the top of `index.ts` in the installed package:
+Edit these values at the top of `index.ts`:
 
 | Constant | Default | Description |
 |----------|---------|-------------|
@@ -58,10 +46,9 @@ Edit these values at the top of `index.ts` in the installed package:
 ## Dependencies
 
 - `aplay` (ALSA player) — for playing the WAV file
-- `sox` — only needed to **generate** a new `alert.wav` (optional)
+- `sox` — only needed to **generate** a new alert.wav (optional)
 
 Both are available on Fedora by default. On Ubuntu/Debian:
-
 ```bash
 sudo apt install alsa-utils sox libsox-fmt-all
 ```
@@ -70,7 +57,7 @@ sudo apt install alsa-utils sox libsox-fmt-all
 
 1. Listens to `turn_end` events (fired after every LLM response)
 2. Calls `ctx.getContextUsage()` to check current token count
-3. When tokens ≥ threshold, plays `alert.wav` via `aplay`
+3. When tokens ≥ threshold, plays `alert.wav` via aplay
 4. Shows a TUI notification and updates the status bar
 5. Resets alert state on `session_compact`
 
@@ -90,16 +77,4 @@ sox -n -t wav c.wav synth 0.55 sine 880 vol 0.65
 sox a.wav b.wav c.wav alert.wav
 ```
 
-## Package
-
-This is a pi package. To update to the latest version:
-
-```bash
-pi update git:git.enne2.net/enne2/context-warn
-```
-
-To remove:
-
-```bash
-pi remove git:git.enne2.net/enne2/context-warn
-```
+Customize the tone by changing the frequency and volume parameters.