Fix frontmatter parsing to preserve YAML privacy tags

[levineam]

Motivation

• The frontmatter scalar parser only captured single-line values and JSON-style arrays, which caused YAML block lists like tags:\n - private and unquoted flow lists like tags: [private] to be mis-parsed and allowed private/sensitive notes to be queued.

Description

• Update parseScalarValue in modules/jarvos-secondbrain/packages/jarvos-secondbrain-notes/src/lib/note-schema.js to collect multiline YAML list items and call stripQuotes on each item.
• Add a fallback for YAML flow sequences so that unquoted bracketed lists (e.g. tags: [private, reference]) are split and stripQuotes-normalized when JSON.parse fails.
• Add an end-to-end regression test manual notes apply recognizes private tags in standard YAML lists in modules/jarvos-secondbrain/tests/manual-notes-maintenance.test.js covering block, quoted block, and flow variants and adjust assertions to validate that the automatic queues contain empty entries for private notes.

Testing

• Ran node --test modules/jarvos-secondbrain/tests/manual-notes-maintenance.test.js and all tests passed (13/13).
• The new regression confirms report.optimization.sensitiveSkipped increased for the private-tag variants and that gbrain-import-queue.json and memory-wiki-queue.json have empty entries as expected.

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Codex Task