[Bug]: Mason allows adding names with conflicts as dependencies, including the current project

[eric-vo]

Summary of Problem

Description:
Mason allows adding names with conflicts as dependencies, including the current project. For example, when in the Parquet GitHub repository cloned locally, it is possible to add Parquet as a dependency, which will result in name conflicts (i.e., Parquet.chpl from the Mason registry versus Parquet.chpl from the current directory).

Is this issue currently blocking your progress?
No.

Steps to Reproduce

1. Clone https://github.com/chapel-lang/Parquet at commit 95d4fac87aada97d314eba8af05b21027e6704e6, and navigate to the Parquet/ directory.
2. Execute mason search --update, followed by mason add Parquet@0.1.2. The dependency add succeeds.

Configuration Information

• Output of chpl --version:

chpl version 2.9.0
  built with LLVM version 22.1.7
  available LLVM targets: xcore, x86-64, x86, wasm64, wasm32, ve, systemz, spirv, spirv64, spirv32, sparcel, sparcv9, sparc, riscv64be, riscv32be, riscv64, riscv32, ppc64le, ppc64, ppc32le, ppc32, nvptx64, nvptx, msp430, mips64el, mips64, mipsel, mips, loongarch64, loongarch32, lanai, hexagon, bpfeb, bpfel, bpf, avr, thumbeb, thumb, armeb, arm, amdgcn, r600, aarch64_32, aarch64_be, aarch64, arm64_32, arm64
Copyright 2020-2026 Hewlett Packard Enterprise Development LP
Copyright 2004-2019 Cray Inc.
(See LICENSE file for more details)

• Output of $CHPL_HOME/util/printchplenv --anonymize:

CHPL_TARGET_PLATFORM: darwin
CHPL_TARGET_COMPILER: llvm
CHPL_TARGET_ARCH: arm64
CHPL_TARGET_CPU: native *
CHPL_LOCALE_MODEL: flat
CHPL_COMM: none *
CHPL_TASKS: qthreads
CHPL_LAUNCHER: none
CHPL_TIMERS: generic
CHPL_UNWIND: system
CHPL_TARGET_MEM: jemalloc
CHPL_ATOMICS: cstdlib
CHPL_GMP: system *
CHPL_HWLOC: bundled
CHPL_RE2: bundled *
CHPL_LLVM: system *
CHPL_AUX_FILESYS: none

• Back-end compiler and version, e.g. gcc --version or clang --version:

Apple clang version 21.0.0 (clang-2100.1.1.101)
Target: arm64-apple-darwin25.5.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin