Release tmeld 0.5.0 · mitnits/tmeld

bmeld a b (or tmeld --web a b) serves the comparison to a browser:
the same vendored engine, palette and keybindings, rendered by CodeMirror
with real SVG linkmap curves. Files, folders and the version-control view
all open as tabs; the process keeps the git-mergetool exit contract.
--bind ADDR / --advertise HOST to reach it from other machines (loopback
by default, with a warning when you open it wider). --port implies --web.
One press of Ctrl-C exits cleanly even with a browser attached; a cache-busted
build id in the footer tells you which bundle you are running.

tmeld and bmeld now share a single parser and validation. --web selects
the browser and --port implies it; options that belong to the other
front-end are refused rather than silently ignored.

Esc quits (warning once if there are unsaved edits); a ✕ closes the lone
comparison when the tab strip is hidden.
Read-only panes get Meld's treatment: the push arrow toward them becomes a
delete (✕), a 🔒 marks the file, and a /dev/null side (as p4 and git pass
for an added or deleted file) is read-only automatically.
One overview map per pane, so the two sides drift apart as they diverge; the
first pane's scrollbar moves to the far left, clear of the linkmap.
Line numbers are hidden by default, matching Meld; the status bar carries
Ln, Col. --show-line-numbers restores them.
Graphics mode: the gutter arrows are Meld's own icons, drawn into the linkmap
and scaled with the font; the insert marker (Meld's thin line for a one-sided
change) is drawn under kitty; the channel takes Meld's grey.
Tab strip: slanted caps, palette colours meeting WCAG contrast, and one fewer
row (the underline is gone).

The Debian package now ships bmeld too, depends on the system aiohttp rather
than bundling it (staying Architecture: all), and maint/mkdeb.sh stamps
each build so rebuilds upgrade in place.

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