Fallback signatures corrupt paths containing '.py' internally: replace('.py','') strips non-suffix occurrences (CLDK-005) #84

From the external v0.3.0/Odoo quality audit, finding CLDK-005 (severity Medium). Plain bug, no schema change — fix applies to both main and the v2 stage chain.

Symptom

Eight Odoo symbols have corrupted path-derived signatures because .py is removed everywhere in the dotted path, not just as the file suffix:

Reproduced exactly:

>>> 'odoo/tools/pycompat.py'.replace('/', '.').replace('.py', '')
'odoo.toolscompat'

Root cause

The fallback signature builder (used when Jedi goto yields nothing) does str(relative_path).replace('/', '.').replace('.py', '') — and str.replace removes every occurrence, so the .py inside .pycompat is deleted along with the suffix. Three sites in codeanalyzer/syntactic_analysis/symbol_table_builder.py: main @ 206, 209, 262; v2 chain @ 217, 220, 281.

Only 8 Odoo symbols are hit because this is the fallback path and few module paths contain an interior .py; corruption then propagates to every symbol keyed under the module prefix.

Fix

Strip the suffix before joining: relative_path.with_suffix('') (or removesuffix('.py') on the string) — never replace. Add a fixture with a .py-embedding name (e.g. pycompat.py, babel/python_extractor.py) asserting the signature prefix, per the audit gate: remove only a terminal extension; every signature begins with the exact path-derived module prefix.