houseCARL 1.2.1 - field-value query, Nexus descriptions, read/write fixes

• New: cross_plugin_query can now filter records by a field's VALUE, not just by type or plugin — e.g. where="MagicSkill = Destruction" or where="BasicStats.Damage >= 50" (operators: = != > >= < <= contains; multiple where= are ANDed). Works on any field you can read.
• New: housecarl_nexus_mod takes an opt-in description=true that returns a mod's full Nexus page write-up as plain text, not just the short catalogue summary.
• Fix: writing into a patch that's already active in your load order no longer fails with a file-lock error.
• Fix: deep reads (depth 5+) of records with conditions (perks, spells, magic effects) no longer flood the output with .NET internals — the actual values are visible again.
• Fix: under a plugins= scope, cross_plugin_query now shows each match from that plugin's own record, not the global load-order winner.