DO-NOT-MERGE · bug: install.sh ships a desktop launcher hardcoded to /home/ishtar — broken for every other user

[Antawari]

DO NOT MERGE — fleet quality burn unit

The reported claim

desktop/retro-writer.desktop pins Exec=/home/ishtar/.local/bin/blog and bin/install.sh copies it with a plain cp (no path rewrite), so on any machine whose home is not /home/ishtar the installed ~/.local/share/applications/retro-writer.desktop Exec points at a nonexistent path and clicking 'Retro Writer' silently fails. Fix = rewrite the Exec line on copy.

Finding: the bug is already FIXED on main

The reported state matches a stale pre-fix checkout. On the current trunk the portability fix already shipped:

• b5212e8 — fix(desktop): make launcher Exec portable, drop hardcoded home path (DO-NOT-MERGE · Fix the broken, internal-path Exec= in the .desktop launcher (public-repo leak + broken for every other user) #2): the source desktop/retro-writer.desktop is now path-free (Exec=blog), and bin/install.sh:33 rewrites the installed copy with sed -i "s|^Exec=.*|Exec=$LOCAL_BIN/blog|" so the menu entry points at the running user's own ~/.local/bin/blog.
• tests/test_desktop_entry.py already pins the Exec string: source carries no /home/, and the installed Exec equals $HOME/.local/bin/blog under a throwaway HOME.

Running install.sh with HOME != /home/ishtar produces Exec=$HOME/.local/bin/blog — the claim's oracle no longer reproduces. No src/script change is warranted.

What this PR adds (the remaining gap, honestly scoped)

The Exec string was pinned, but nothing verified the launcher target actually exists — the precise reason clicking 'Retro Writer' would silently fail. This adds one regression test to tests/test_install.py:

• test_installed_desktop_exec_target_is_a_real_clickable_file — runs install.sh under a throwaway HOME, then asserts the installed entry's Exec resolves to a real, clickable file (the blog symlink install.sh just created), and never leaks /home/ishtar.

Falsifiable, not vacuous

Verified the test is a genuine guard: reintroducing the original bug (hardcode the source Exec back to /home/ishtar/... + drop the sed rewrite for a plain cp) turns it RED; against fixed main it is GREEN.

Gate

Full repo gate (./run-tests.sh: shellcheck + pytest-under-coverage + 95% coverage gate) green in an isolated venv: 105 passed, shellcheck clean, bin/crt-theme coverage 100%. No test weakened/skipped/deleted; no budget inflated; no tracker IDs in shipped src.

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