Fix "tac command not found" on macOS by using POSIX awk

[RoduanKD]

Summary

Replace tac with POSIX awk in project-install.sh to fix "command not found" error on macOS.

Linked item

• Closes: #

Checklist

• Linked to related Issue/Discussion
• Documented steps to test (below)
• Drafted "how to use" docs (if this adds new behavior)
• Backwards compatibility considered (notes if applicable)

Documented steps to test

1. Run scripts/project-install.sh on macOS — verify no "tac: command not found" error
2. Run scripts/project-install.sh on Linux — verify behavior is unchanged
3. Use a profile with inheritance and confirm the chain displays in the correct (reversed) order

Notes for reviewers

tac is a GNU coreutils utility not available on macOS by default. The replacement awk '{a[NR]=$0} END{for(i=NR;i>=1;i--)print a[i]}' is POSIX-compliant and works on both macOS and Linux. No behavioral change — output is identical.