feat(savedata): parse zenny/gzenny/CP from ZZ save blob

Adds read-only parsing for three scalar fields in the ZZ character save
blob: zenny (0xB0), gzenny (0x1FF64) and caravan points (0x212E4). Also
registers an offset for current_equip (0x1F604); extraction deferred
until its length is reverse-engineered. Offsets sourced from
Chakratos/mhf-save-manager and validated against a live HR999 blob.

Scope is intentionally ZZ-only: mhf-save-manager's F5 and G1-G5.2 maps
are not validated against live data, and the dormant pPlaytime vs
item_pouch collision in those versions is not resolved yet. Non-ZZ
modes leave the new pointers unmapped, and the read path is guarded by
`ok && off > 0 && off+size <= len(blob)` so unverified versions cannot
accidentally read from the blob.

Tests cover positive-path roundtrip (including live kirito blob),
regression guards for existing fields, non-ZZ isolation, new-character
skip, and bounds safety against truncated blobs.

.gitignore

@@ -37,6 +37,9 @@ deploy.sh
 # Test/build artifacts
 coverage.out
 
+# Local save blob dumps (PII)
+tmp/
+
 # Claude Code local config
 .claude/
 CLAUDE.local.md