read: the "[path  |  N lines  |  size]" header plaque is now dim with the
path highlighted in accent (offset/limit plaque "… lines A–B of N …"
likewise); the "⚠ Large file …" warning line renders in warning color; the
file body renders in text (was dim — readable now) with no syntax
highlighting (rejected by design); numbered reads dim the line numbers and
render line content in text. read errors (not_found, file_too_large) render
in tool_error.

info: each "key:     value" line highlights the key (incl. colon) in accent,
the alignment padding in dim, and the value in text.

Fallback narrowed to write/edit/append/move/copy/delete/mkdir/exists/find/
find_up/query/unknown (statuses and find/query intentionally untouched).
Diff/list/grep from stage 1 unchanged.

6 new tests (read plaque/offset/warn/numbered/error, info keys+values);
24 filesystem-renderer tests total. Full suite 809 passed, 1 skipped.

Co-Authored-By: Claude <noreply@anthropic.com>