feat: implement gloss-core data layer

Public API: gloss-core-lookup, gloss-core-save, gloss-core-list, gloss-core-find-buffer-position. Save inserts entries at the alphabetical position (case-insensitive compare), creates the file and parent directory on first call, prompts on collision via completing-read over Replace/Append/Cancel, and updates the in-memory cache directly.

Lookup checks gloss-file's mtime against the cached load time. If disk is newer than the buffer, it reverts the buffer first. Out-of-band edits land on the next read. Parser failures during reload preserve the existing cache and surface a one-line message.

Tested by the 32-test suite from the previous commit. All 32 pass in 0.16 seconds.

The defgroup and defcustoms (gloss-file, gloss-debug) live here rather than in gloss.el. That keeps the data layer self-contained when tests load it directly without the orchestration layer.

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