[nissuor]

Repeated native completion records and .msp-view session copies currently inflate Muse token and prompt totals. This deduplicates valid completions by record ID across session files and retained-frame children, and excludes .msp-view* directories inside the sessions tree.

Records without a usable ID remain countable, and metadata or malformed usage cannot claim an ID before a valid completion. The scan-cache version is bumped so previously inflated totals are rescanned. Existing opencode, subscription, and PAYG behavior is preserved.

This targets add-muse-usage-collector for inclusion in omacom#10610, following our collaboration discussion. No revert of the subscription-window commit is needed. Hiding cached limits after a failed probe can be reviewed separately.

Validation:

• New deduplication regression test fails before the fix and passes afterward; covers plain records, retained frames, copied sessions, view directories, missing/malformed IDs, and old scan caches.
• Existing Muse scanner and limits suites pass.
• git diff --check passes. Ran ./test/all with the desktop environment variables unset: CLI passes; the shell suite has the same five failures previously reproduced on an untouched upstream snapshot. config-test.sh, snapper-test.sh, and unowned-system-paths-test.sh need a missing sibling omarchy-pkgs checkout; launch-about-test.sh fails its roomy-window animation assertion; locate-test.sh tries to decode generated Python bytecode as UTF-8.