1. 1. Summary
      SERVER-132885 slowed install targets after a shared convenience-tree race was found. This branch keeps publication race-safe while consolidating each `mongo_install_rule` into one install action, validating destination ownership during analysis, and avoiding unnecessary large-file copies.

1. 1. Changes

• `bazel/install_rules/install_rules.bzl`: normalize destinations, assign unique owners, reject exact/prefix/case-insensitive overlaps during analysis, and avoid republishing child install trees from aggregate targets.
• `bazel/install_rules/install_rules.py`: materialize action outputs with hardlinks where safe, preserve stable Bazel output symlinks, stage shared destinations outside the lock, and publish them with transactional renames and rollback.
• `bazel/install_rules/README.md`: document the architecture and safety invariants.
• Added analysis and runtime coverage for collisions, deduplication, symlinks, cross-device fallback, failures, and concurrent publication.

1. 1. Timing
      These are Bazel profile durations for the install action only; compile and analysis time are excluded.

The hardlink change reduces the comparable C install action by about 89%. A separate explicit shared-install-environment run measured 2.082 s, but the direct sandbox did not refresh the host convenience mount, so 9.903 s is the primary comparable C result.

1. 1. Safety
      Exact, prefix, and case-insensitive destination conflicts fail during analysis. Stable output symlinks are hardlinked without dereferencing; unsafe source or sandbox-local symlinks are copied so published trees cannot dangle. Shared publication holds the lock only for final renames and restores the previous destination if interrupted.

1. 1. Testing

• `bazel --batch test --config=local //bazel/install_rules:install_rules_script_test` (16/16 passing).
• `bazel --batch run lint – //bazel/install_rules:install_rules_script_test` (passing targeted rules-lint, Pyright, and ESLint checks).
• `bazel run format` and `git diff --check` pass.
• Required Evergreen patch: https://spruce.corp.mongodb.com/version/6a7eb26c19db910007db09a7