refactor!: use main Tree-sitter branch

[olimorris]

Description

This PR will get the plugin ready for when main becomes the default over on nvim-treesitter.

Checklist

• I've read the contributing guidelines and have adhered to them in this PR
• I've updated CodeCompanion.has in the init.lua file for my new feature
• I've added test coverage for this fix/feature
• I've updated the README and/or relevant docs pages
• I've run make all to ensure docs are generated, tests pass and my formatting is applied

[Copilot]

Pull Request Overview

This PR refactors CodeCompanion to support the new main branch of nvim‑treesitter and updates the minimum Neovim version from 0.10 to 0.11. Key changes include:

• Cloning and installing nvim‑treesitter from the main branch.
• Updating Neovim version checks and error messages across the plugin and health scripts.
• Adjusting installation steps in minimal init files and CI workflows.

Reviewed Changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/screenshots/*	Updated screenshot files with new outputs reflecting refactored test setups.
scripts/minimal_init.lua	Updated Treesitter installation process and registration of markdown.
plugin/codecompanion.lua	Updated Neovim version check and error message.
minimal.lua	Adjusted lazy plugin dependency for nvim‑treesitter using the main branch.
lua/codecompanion/health.lua	Updated health check for Neovim version.
ftplugin/codecompanion.lua	Added minimal Treesitter startup routine.
Makefile	Updated repository clone command to target the main branch of nvim‑treesitter.
.github/workflows/ci.yml	Modified CI steps and added tree‑sitter CLI installation.
.github/ISSUE_TEMPLATE/bug_report.yml	Updated Treesitter dependency and installation instructions.

[olimorris]

Not sure why v0.10.0 tests are failing here

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[yavorski]

Hi! I'm currently waiting for this PR to be merged and using the following workaround in the meantime (NOTE: I'm not using any markdown rendering plugins). Might be helpful for others who have migrated to the tree-sitter main branch as well.

--- treesitter for chat buffers
--- NOTE remove when this PR is merged #1547 
vim.api.nvim_create_autocmd("User", {
  pattern = "CodeCompanionChatCreated",
  group = vim.api.nvim_create_augroup("my-codecompanion-chat", { clear = true }),
  callback = function(event)
    vim.treesitter.start(event.data.bufnr, "markdown")
  end
})

[olimorris]

Great share @yavorski. I've added this to my previous announcement.