Record tool usage using hooks instead

[haoranpb]

Previous metrics parsing relies on the debug logs, which no longer contains the tool usage.

Instead of relying on logs parsing, we leverage PreToolUse hook to record all tool usage

[Copilot]

Pull request overview

This PR updates BC-Bench’s agent metrics collection to stop relying on Copilot/Claude debug logs for tool usage (which no longer include it) and instead records tool usage via PreToolUse hooks, then parses a dedicated tool_usage.jsonl output.

Changes:

• Add hook setup + a PowerShell hook script to log tool usage to tool_usage.jsonl.
• Add a shared parser for the hooks output and wire it into Copilot/Claude agents.
• Remove tool-usage-from-log parsing, keep Copilot turn counting from session logs, and update tests accordingly.

Reviewed changes

Copilot reviewed 17 out of 18 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/bcbench/operations/hooks_operations.py	New operation to write Copilot/Claude hook configuration and define tool usage log destination.
src/bcbench/agent/shared/hooks_parser.py	New JSONL parser that aggregates tool usage counts from hook output.
src/bcbench/agent/shared/hooks/log-tool-usage.ps1	New hook script that appends tool usage entries to a JSONL file.
src/bcbench/agent/copilot/metrics.py	Removes tool usage parsing from Copilot logs; keeps turn counting.
src/bcbench/agent/copilot/agent.py	Configures hooks and attaches parsed tool usage to collected metrics.
src/bcbench/agent/claude/metrics.py	Removes debug-log-based tool usage parsing from Claude metrics.
src/bcbench/agent/claude/agent.py	Configures hooks and attaches parsed tool usage to collected metrics.
src/bcbench/commands/run.py	Updates “copilot-inspector” to use hook-based tool usage parsing + log-based turn counting.
src/bcbench/config.py	Adds hook script path and new file-pattern config entries.
src/bcbench/operations/__init__.py	Exposes setup_hooks via operations package exports.
src/bcbench/agent/shared/__init__.py	Re-exports parse_tool_usage_from_hooks.
tests/test_hooks_parser.py	New unit tests for hook JSONL parsing behavior.
tests/test_hooks_operations.py	New unit tests for hook config generation for Copilot/Claude.
tests/test_tool_usage_parser.py	Replaces tool-usage-from-log tests with turn-count-from-log tests.
tests/test_copilot_metrics_parsing.py	Removes tool usage assertions from session logs; keeps turn count assertions.
tests/test_claude_code_metrics.py	Removes debug-log tool usage tests; asserts tool usage remains None without hooks.
pyproject.toml / uv.lock	Version bump to 0.5.2.