agents: render Copilot CLI 'rg' search tool

[roblourens]

Adds first-class rendering for the Copilot CLI rg and grep search tools in VS Code's agent host.

Changes

Tool display (copilotToolDisplay.ts)

• Recognizes rg as a first-class tool alongside grep
• Shows Searching for "{pattern}" while running and Searched for "{pattern}" when complete
• Separate ICopilotGrepToolArgs / ICopilotRgToolArgs interfaces matching the EH-CLI GrepTool schema
• rg reuses the grep l10n keys to avoid duplicate strings for translators

Search icon pipeline

• Added IChatSearchToolInvocationData { kind: 'search' } to the toolSpecificData discriminated union
• getToolKind() in copilotToolDisplay.ts returns 'search' for grep/rg tools
• stateToProgressAdapter.ts sets toolSpecificData = { kind: 'search' } for running and completed search tools
• Icon rendering: chatThinkingContentPart.ts detects toolSpecificData.kind === 'search' and shows Codicon.search as the outer type-icon — consistent with how terminal tools use isTerminalTool to show Codicon.terminal
• The inner status icon (check / spinner) comes from getIcon() in BaseChatToolInvocationSubPart as normal

Tests

• 4 unit tests in copilotToolDisplay.test.ts covering rg/grep invocation and past-tense messages

(Written by Copilot)

[Copilot]

Pull request overview

Adds first-class display support for the Copilot CLI rg search tool in the agent-host so rg tool calls render like grep (as “Search”) instead of falling back to the generic “Using/Used …” messaging.

Changes:

• Add rg to the known Copilot tool names and implement dedicated display/invocation/past-tense/input-string handling.
• Expand the typed grep args schema to match current CLI behavior and introduce a parallel rg args interface.
• Add focused unit tests covering rg/grep invocation & completion messages and getToolInputString.

Show a summary per file

File	Description
src/vs/platform/agentHost/node/copilot/copilotToolDisplay.ts	Adds rg tool support and updates grep/rg argument typing + message rendering.
src/vs/platform/agentHost/test/node/copilotToolDisplay.test.ts	Adds tests validating rg/grep rendering parity and pattern extraction.

Copilot's findings

Comments suppressed due to low confidence (1)

src/vs/platform/agentHost/node/copilot/copilotToolDisplay.ts:450

• Same localization duplication concern as in getInvocationMessage: toolComplete.rgPattern/toolComplete.rg introduce new keys even though the text matches the grep completion messages. Reusing the grep keys until divergence would reduce translation churn.

		case CopilotToolName.Rg: {
			const args = parameters as ICopilotRgToolArgs | undefined;
			if (args?.pattern) {
				return md(localize('toolComplete.rgPattern', "Searched for {0}", appendEscapedMarkdownInlineCode(truncate(args.pattern, 80))));
			}
			return localize('toolComplete.rg', "Searched files");
		}

• Files reviewed: 2/2 changed files
• Comments generated: 2

[github-actions]

blocks-ci screenshots changed

Replace the contents of test/componentFixtures/blocks-ci-screenshots.md with:

Updated blocks-ci-screenshots.md

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