Update inputs: computing_math/os_log_permission_guard_v1/base

tasks/computing_math/os_log_permission_guard_v1/base/input/active_writers.json

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+{
+  "active_writers": [
+    "/var/logs/worker.log"
+  ]
+}

tasks/computing_math/os_log_permission_guard_v1/base/input/environment_notes.md

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+# Environment Notes
+
+- Treat `syslog` as the protected system user.
+- Ownership truth comes from `ownership.csv`.
+- Initial permission truth comes from `permissions.csv`.
+- Files listed in `active_writers.json` must not be modified.
+- Evaluation is based on the final metadata/file state inside the reconstructed workspace rather than real kernel-level ownership or process tables.
+- The intended target workspace after running `setup.sh` is `./sandbox_fs`.

tasks/computing_math/os_log_permission_guard_v1/base/input/fs_snapshot.tar.gz

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:a9b85d99cfd8c9b0b35e0ba2ba67d2a6d194a16b6a578d758d39c11611296db4
+size 676

tasks/computing_math/os_log_permission_guard_v1/base/input/ownership.csv

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+path,owner,group
+/var/logs/app.log,appuser,app
+/var/logs/worker.log,appuser,app
+/var/logs/audit.log,auditor,audit
+/var/logs/sys.log,syslog,syslog
+/var/logs/metrics.log,monitor,ops
+/var/logs/notes.txt,appuser,app

tasks/computing_math/os_log_permission_guard_v1/base/input/permissions.csv

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+path,mode
+/var/logs/app.log,640
+/var/logs/worker.log,644
+/var/logs/audit.log,600
+/var/logs/sys.log,640
+/var/logs/metrics.log,644
+/var/logs/notes.txt,644

tasks/computing_math/os_log_permission_guard_v1/base/input/setup_workspace.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+if [[ $# -ne 1 ]]; then
+  echo "Usage: $0 OUTPUT_DIR" >&2
+  exit 2
+fi
+
+INPUT_DIR="$(cd "$(dirname "$0")" && pwd)"
+OUTPUT_DIR="$(mkdir -p "$1" && cd "$1" && pwd)"
+SANDBOX="${OUTPUT_DIR}/sandbox_fs"
+
+rm -rf "${SANDBOX}"
+mkdir -p "${SANDBOX}"
+tar -xzf "${INPUT_DIR}/fs_snapshot.tar.gz" -C "${SANDBOX}"
+
+while IFS=, read -r path mode; do
+  [[ "${path}" == "path" ]] && continue
+  path="${path%$'
+  mode="${mode%$'
+  chmod "${mode}" "${SANDBOX}${path}"
+done < "${INPUT_DIR}/permissions.csv"
+
+cp "${INPUT_DIR}/ownership.csv" "${OUTPUT_DIR}/ownership.csv"
+cp "${INPUT_DIR}/permissions.csv" "${OUTPUT_DIR}/permissions.csv"
+cp "${INPUT_DIR}/active_writers.json" "${OUTPUT_DIR}/active_writers.json"
+
+echo "Workspace ready at ${SANDBOX}"

tasks/computing_math/os_log_permission_guard_v1/base/input/task_instructions.md

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+# OS Log Permission Guard v1
+
+You are working on a Linux VM. Use the prepared metadata and filesystem snapshot
+to update log-file permissions safely.
+
+## Inputs
+
+- `fs_snapshot.tar.gz` contains the sandbox filesystem with `/var/logs` files.
+- `ownership.csv` is the ownership source of truth.
+- `permissions.csv` is the initial permission source of truth.
+- `active_writers.json` lists files that are treated as actively written and must not be modified.
+- `setup_workspace.sh` reconstructs a writable sandbox under the output directory.
+
+The active-writer list is declarative for this benchmark. Do not try to kill or
+interfere with processes.
+
+## Required Work
+
+1. Run `input/setup_workspace.sh output` from the task root, or otherwise create
+   an equivalent workspace at `output/sandbox_fs`.
+2. Change every regular `.log` file under `output/sandbox_fs/var/logs` to mode
+   `444`, except:
+   - files owned by `syslog` according to `ownership.csv`;
+   - files listed in `active_writers.json`.
+3. Do not modify non-`.log` files.
+4. Do not change file contents.
+5. Do not change the ownership/group metadata reported in your final state.
+6. Write `output/final_state.json` with one entry for every file listed in
+   `ownership.csv`.
+
+## final_state.json Format
+
+Use either a list or mapping under the top-level key `files`. Each file entry
+must include `path`, `type`, `owner`, `group`, and `mode`.
+
+Example list form:
+
+```json
+{
+    "files": [
+    {
+      "path": "/var/logs/example.log",
+      "type": "regular",
+      "owner": "exampleuser",
+      "group": "example",
+      "mode": "444"
+    }
+  ]
+}
+```