feat: skip instruction injection on read operations

Instructions are only relevant when the AI edits or writes files,
not when it reads them. Remove 'read' from FILE_TOOLS and update docs.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: klocus

README.md

@@ -59,7 +59,7 @@ The plugin will handle the rest, notifying you via the tool output whenever path
 
 ### Injection
 
-When the AI performs a `read`, `edit`, or `write` operation on a file, the plugin:
+When the AI performs an `edit` or `write` operation on a file, the plugin:
 
 1. Finds all `*.instructions.md` files whose `applyTo` patterns match the target file path.
 2. Injects them **once per session** — subsequent operations on matching files won't repeat the injection.

src/path-instructions.ts

@@ -30,7 +30,7 @@ interface InstructionFile {
 }
 
 /** File tools that operate on file paths */
-const FILE_TOOLS = new Set(['read', 'edit', 'write'])
+const FILE_TOOLS = new Set(['edit', 'write'])
 
 /** Marker format used to track injected instructions in message history */
 const MARKER_PREFIX = 'path-instruction'