fix(go): resolve receiver method calls (#830 with main merged)

[tirth8205]

Carries #830 (author merlincat11) with current main merged in and the test-anchor conflict against #833 resolved by keeping both test blocks. Validated locally: tests/test_multilang.py 464 passed, full suite 2475 passed, ruff and mypy clean.

Opened because the source branch needs a conflict resolution that cannot be pushed to the fork from here. Merging this lands the original commits unchanged, so #830 will show as merged.

Fixes #829.

[github-actions]

code-review-graph review

Overall risk: 0.55 (MEDIUM) — 46 changed function(s)/class(es), 0 affected flow(s), 34 test gap(s)

Risk-scored changes

Risk	Level	Symbol	Location	Tested
0.55	medium	code_review_graph/parser.py::CodeParser._get_member_call_receiver_method	code_review_graph/parser.py:10895	no
0.40	medium	code_review_graph/parser.py::CodeParser._extract_from_tree	code_review_graph/parser.py:6248	no
0.40	medium	code_review_graph/parser.py::CodeParser._go_receiver_binding_index	code_review_graph/parser.py:14870	yes
0.40	medium	code_review_graph/parser.py::CodeParser.scope_key	code_review_graph/parser.py:14878	no
0.40	medium	code_review_graph/parser.py::CodeParser._go_receiver_is_shadowed	code_review_graph/parser.py:14979	yes
0.35	low	code_review_graph/parser.py::CodeParser._go_function_parameters_bind_name	code_review_graph/parser.py:14858	no
0.30	low	code_review_graph/parser.py::CodeParser	code_review_graph/parser.py:2405	yes
0.30	low	code_review_graph/parser.py::CodeParser._go_field_binds_name	code_review_graph/parser.py:14841	no
0.30	low	tests/fixtures/sample_go.go::InMemoryRepo.SaveAndReturn	tests/fixtures/sample_go.go:41	no
0.30	low	tests/fixtures/sample_go.go::ShadowA	tests/fixtures/sample_go.go:45	no

Test gaps

• code_review_graph/parser.py::CodeParser._resolve_call_targets (code_review_graph/parser.py:4652)
• code_review_graph/parser.py::CodeParser._extract_from_tree (code_review_graph/parser.py:6248)
• code_review_graph/parser.py::CodeParser._extract_functions (code_review_graph/parser.py:10310)
• code_review_graph/parser.py::CodeParser._extract_calls (code_review_graph/parser.py:10640)
• code_review_graph/parser.py::CodeParser._get_member_call_receiver_method (code_review_graph/parser.py:10895)
• ...and 29 more without direct tests

Token savings: this graph-backed report used ~202,502 fewer tokens (~96%) than reading every changed file in full (estimated, chars/4 approximation).

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