clean up unused chat replay feature

[amunger]

I think several things have broken with this feature with no complaints, and there are much easier ways to troubleshoot now, so we should just yank this out

[Copilot]

Pull request overview

Removes the unused “chat replay” feature (participant, notebook serializer, debug session, and tool) and updates request log exporting to a simpler JSON export format.

Changes:

• Deleted the chat replay runtime implementation (participant/session provider/notebook serializer/debug adapter) and its associated tests.
• Removed the tool_replay tool and all related tool name/registration/snapshot references.
• Switched request log JSON export helpers from the replay module to chatLogExport and changed default export filenames to *.json.

Reviewed changes

Copilot reviewed 26 out of 27 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/extension/tools/node/toolReplayTool.tsx	Deleted tool implementation used to replay tool results from recorded sessions.
src/extension/tools/node/allTools.ts	Removed registration import for the deleted tool replay tool.
src/extension/tools/common/toolNames.ts	Removed ToolReplay from tool enums and category mapping.
src/extension/replay/vscode-node/test/chatReplayNotebook.spec.ts	Deleted notebook serializer/export tests for the removed replay feature.
src/extension/replay/vscode-node/replayDebugSession.ts	Deleted debug adapter session used for stepping through replay logs.
src/extension/replay/vscode-node/chatReplaySessionProvider.ts	Deleted chat session content provider for replay logs.
src/extension/replay/vscode-node/chatReplayParticipant.ts	Deleted chat participant that executed replay steps and invoked the replay tool.
src/extension/replay/vscode-node/chatReplayNotebookSerializer.ts	Deleted notebook serializer for *.chatreplay.json files.
src/extension/replay/vscode-node/chatReplayContrib.ts	Deleted contribution wiring for the replay participant, notebook serializer, and debug adapter/commands.
src/extension/replay/node/replayParsing.spec.ts	Deleted replay parser unit test.
src/extension/replay/node/replayParser.ts	Deleted replay parser used to interpret exported replay JSON into steps.
src/extension/replay/node/chatReplayExport.ts	Deleted replay export helpers (replaced by chat log export helpers).
src/extension/replay/common/chatReplayResponses.ts	Deleted shared replay response queue/state container.
src/extension/prompts/node/agent/test/snapshots/agentPrompts-claude-sonnet-4.5/all_tools.spec.snap	Updated snapshot to remove tool_replay from available tools list.
src/extension/prompts/node/agent/test/snapshots/agentPrompts-claude-sonnet-4.5/all_non_edit_tools.spec.snap	Updated snapshot to remove tool_replay from available tools list.
src/extension/prompts/node/agent/test/snapshots/agentPrompts-claude-opus-4.6/all_tools.spec.snap	Updated snapshot to remove tool_replay from available tools list.
src/extension/prompts/node/agent/test/snapshots/agentPrompts-claude-opus-4.6/all_non_edit_tools.spec.snap	Updated snapshot to remove tool_replay from available tools list.
src/extension/prompts/node/agent/test/snapshots/agentPrompts-claude-opus-4.6-fast/all_tools.spec.snap	Updated snapshot to remove tool_replay from available tools list.
src/extension/prompts/node/agent/test/snapshots/agentPrompts-claude-opus-4.6-fast/all_non_edit_tools.spec.snap	Updated snapshot to remove tool_replay from available tools list.
src/extension/prompts/node/agent/test/snapshots/agentPrompts-claude-opus-4.5/all_tools.spec.snap	Updated snapshot to remove tool_replay from available tools list.
src/extension/prompts/node/agent/test/snapshots/agentPrompts-claude-opus-4.5/all_non_edit_tools.spec.snap	Updated snapshot to remove tool_replay from available tools list.
src/extension/log/vscode-node/requestLogTree.ts	Switched export helpers to chatLogExport and changed default JSON export filenames.
src/extension/log/node/chatLogExport.ts	Refactored export types/helpers to replace removed replay export module.
src/extension/extension/vscode-node/contributions.ts	Removed registration of the deleted ChatReplayContribution.
package.nls.json	Removed command titles for deleted edit tracing commands.
package.json	Removed tool contribution, replay chat participant, replay commands/menus, notebook association, and debugger contribution for replay.

Comments suppressed due to low confidence (1)

src/extension/log/node/chatLogExport.ts:86

• ExportedPrompt is exported (and imported by requestLogTree), but its logs property references ExportedLogEntry, which is not exported from this module. TypeScript will error on exporting a type that uses a private name. Export ExportedLogEntry (and any referenced types like ExportedLogMetadata), or inline those types into the exported interfaces.