Normalize frontmatter taxonomy across 293 document transcriptions

Categories now match folder names (15 canonical values).
Types normalized to 25 canonical values per VAULT_MAP.md spec.
Context-aware mapping: W-2s→tax-form, lease files→lease, vet records→vet, etc.

documents/tax/2022/f8833_2022_blank.md

@@ -1,5 +1,5 @@
 ---
-type: form-8833
+type: tax-form
 category: tax
 person: [xuewei-jiang]
 date: 2022-12-01

documents/tax/2022/f8833_2022_filled.md

@@ -1,5 +1,5 @@
 ---
-type: form-8833
+type: tax-form
 category: tax
 person: xuewei-jiang
 date: 2022-04-18

documents/tax/2022/f8833_2022_print.md

@@ -1,5 +1,5 @@
 ---
-type: form-8833
+type: tax-form
 category: tax
 person: xuewei-jiang
 date: 2022-04-18

documents/tax/2022/jiang_1099_stock_2022.md

@@ -1,5 +1,5 @@
 ---
-type: 1099
+type: tax-form
 category: tax
 person: [xuewei-jiang, yanxin-lu]
 date: 2022-12-31

documents/tax/2022/jiang_w2_uchicago_2022.md

@@ -1,5 +1,5 @@
 ---
-type: w2
+type: tax-form
 category: tax
 person: xuewei-jiang
 date: 2022-12-31

documents/tax/2022/jiang_w2_usc_2022.md

@@ -1,5 +1,5 @@
 ---
-type: w2
+type: tax-form
 category: tax
 person: xuewei-jiang
 date: 2022-12-31

documents/tax/2022/lu_1099_stock_2022.md

@@ -1,5 +1,5 @@
 ---
-type: 1099
+type: tax-form
 category: tax
 person: yanxin-lu
 date: 2022-12-31

documents/tax/2022/lu_w2_meta_2022.md

@@ -1,5 +1,5 @@
 ---
-type: w2
+type: tax-form
 category: tax
 person: yanxin-lu
 date: 2022-12-31

documents/tax/2022/mortgage_1098_2022.md

@@ -1,5 +1,5 @@
 ---
-type: 1098
+type: tax-form
 category: tax
 person: [xuewei-jiang, yanxin-lu]
 date: 2022-12-31