feat(lsp): code action to rewrite selection with instruction detection

- Adds textDocument/codeAction handler that rewrites the selected range.\n- Instruction preference: strict ;text; marker first, then //, #, -- line comments, then single-line block comments (/* */ and <!-- -->). Earliest in the selection wins.\n- Removes the matched instruction from the selection before sending to LLM.\n- README: document code action workflow and instruction formats.

1 files changed, 1 insertions, 5 deletions

diff --git a/IDEAS.md b/IDEAS.md
index d7ef0d0..ba9b204 100644
--- a/IDEAS.md
+++ b/IDEAS.md
@@ -61,9 +61,5 @@ language-servers = [ "gopls", "golangci-lint-lsp", "hexai" ]
 
 [language-server.hexai]
 command = "hexai"
-`
+```
 
-## Prompting
-
-* Write a new function: `;Implement a function that adds two numbers;`
-* Replace a whole line: `some other text here ;Implement a function that adds two numbers;`