Add a search over the log view

[wallstop]

DISCLOSURE: LLM-GENERATED TEXT

Why:

A log buffer is the newest 256 lines and nothing else, so finding one error
meant reading past the other 255. Nothing narrowed the view (#195).

What:

• find <text> keeps only the matching lines, jumps to the first, and reports the count; find and F3/Shift+F3 step through the matches, clear-filter restores.
• A search never matches a command echo: both surfaces echo the typed line before the handler runs, so the search's own echo held the query and every search found itself.
• Echoes are excluded by type, not by the trailing-echo walk copy-log uses, which made the count depend on whether anything had been logged since.
• The search narrows the window RefreshLogs already read: one pass, no second read of the buffer.

How we know:

EditMode 669/669. PlayMode 654 with the same 5 failures unmodified master produces here, measured by stashing.
Red-green by mutation, twice; the F3 and scroll-jump tests skip on this host with the reason.

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Note

Medium Risk
Touches terminal UI refresh, scroll/tail behavior, and log-counting contracts where subtle echo/reply exclusions can skew results; scope is localized and heavily tested but affects a primary developer workflow surface.

Overview
Adds log view search to DxCommandTerminal: find <text> filters visible lines (case-insensitive substring on displayed text), jumps to the first match, and reports match/total counts; bare find and F3 / Shift+F3 step matches with wrap; clear-filter restores the full log.

Implementation centers on a new LogFilter applied during RefreshLogs (one buffer read, filtered render array) plus TerminalUI scroll queuing so matches scroll into view without fighting tail-follow. Built-in find / clear-filter commands delegate to the active TerminalUI.

The change extends the log-echo contract: command Input echoes never match (by type, not position—unlike copy-log); the console’s status replies are excluded from both match and denominator via IgnoreOwnReply on exact logged text. EnterCommand skips re-attaching the log tail when a find scroll is pending so search navigation isn’t overwritten by scroll-to-end.

Docs (README, CHANGELOG, log-echo-contract skill) and EditMode / PlayMode tests cover filter rules, keyboard routing, stable counts, and EnterCommand ordering.

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