fix: add missing capture groups to multilingual named_months regex patterns

[Whishp]

Problem

mnemosyne_remember raises IndexError: no such group when the input contains Russian, Italian, or Spanish date strings or Russian/Italian negation sentences. This is triggered inside extract_and_store_facts() where the code unconditionally calls m.group(1) on pattern matches that have zero capture groups.

Root cause

named_months patterns (original fix)

Language	Old pattern	Groups	Problem
Russian (ru)	r'(?:...)...	0	m.group(1) → IndexError
Italian (it)	r'(?:...)...	0	m.group(1) → IndexError
Spanish (es)	`r'(\d{1,2})...de...(enero	...)...(?:de(\d{4}))?'`	3

English and German named_months patterns were correct (1 capture group).

negation patterns (added in v2)

Language	Old pattern	Groups	Problem
Russian (ru)	r'(?:...)...	0	m.group(1) → IndexError
Italian (it)	r'(?:...)...	0	m.group(1) → IndexError

English, German, and Spanish negation patterns already had >=1 capture group.

Fix

named_months

1. Russian named_months: wrapped (?:...) → ((?:...)) — now has 1 capture group
2. Italian named_months: same fix
3. Spanish named_months: consolidated all 3 groups into 1 outer group

negation

4. Russian negation: wrapped (?:...) → ((?:...)) — now has 1 capture group
5. Italian negation: same fix

Defense-in-depth

6. Wrapped all three extract_and_store_facts() calls (remember() dedup path, remember() new-row path, remember_batch()) in try/except so regex extraction failures never block memory storage

Impact

Any Russian, Italian, or Spanish text containing date references or Russian/Italian negation phrases causes remember() to crash. The try/except guard prevents similar undiscovered pattern issues from affecting memory writes.

Full verification

All 35 patterns (5 languages × 7 types: named_months, negation, decision, entity, sequence, instruction, preference) were programmatically verified:

• All have >=1 capture group
• entity patterns have exactly 2 (used with m.group(1) + m.group(2))
• Runtime tested with real text samples for all languages
• All compiled without regex syntax errors

Statistics

• Files changed: 1 (mnemosyne/core/beam.py)
• Additions: +18, Deletions: -6