Close two ways the permission system could be bypassed:
- Workspace path traversal: normalize `.`/`..` lexically before the
boundary prefix comparison so paths like `/workspace/../../etc` can no
longer escape the sandbox. Fixed in both the runtime enforcer and the
duplicate check in the tools PowerShell path classifier.
- read-only mode no longer trusts the leading token alone: reject shell
metacharacters (chaining/substitution/redirect/pipe/subshell), drop
interpreters and build drivers (python/node/ruby/cargo/rustc) from the
allow-list, gate `git` to non-mutating subcommands, and reject `find`
actions that execute or delete.
Adds regression tests for both holes. The pre-existing, unrelated
worker_boot git-metadata test failure is not affected by this change.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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