fix(python): keep builtin-named members of absolutely imported project modules

[BGamboa13]

fix(python): keep builtin-named members of absolutely imported project modules

Problem

A Python project module's function named like a built-in method — get, write, update, items, find, read… — was dropped as a dict/list/file method whenever the module was imported by its absolute package path, which is how src-layout projects import their own code. Only relative imports were recognised as project modules.

# src/app/db.py
def get(key): ...
# tests/test_x.py
from app import db
db.get("k")            # before: no calls edge (treated as dict.get)   after: -> app/db.py::get
import app.store as store
store.write(rec)       # same

What changes

• isPythonProjectModule falls back to the dotted-module file lookup (findPythonModuleFile), as resolvePythonModuleMember already did.
• To keep that from linking .get() / .write() on an unrelated object, a receiver that the call's own function rebinds is no longer treated as the module: parameter, with … as / for / except … as target, plain/augmented/annotated assignment, walrus, del, a nested def/class of that name, a comprehension or lambda variable on the call's own statement, a function-local import of a different module under the same name, a match capture. Keyword arguments, comments, strings and sibling or nested function bodies never count as rebinding. An enclosing function's locals apply to a nested def.
• Function scopes are built once per file (memoized per context, cleared with the other import memos), so indexing time is unchanged.

Resolution only: no extraction change, EXTRACTION_VERSION untouched (main is already at the unreleased 28).

Precision evidence

• A 1,544-file src-layout Python project: 2,261 new edges (2,247 calls, 14 references). Population check: 2,261/2,261 have a receiver that is the imported project module (checked with the AST, independent of the resolver); 0 receivers rebound in scope. 54/54 hand-checked edges true (100%, 93.4–100% at 95%).
• store.write incoming edges 41 → 1,675 with 0 false positives; file/socket/buffer .write() calls stay unresolved. Other targets (store.get, doctrine.get, registry.find, …) show the same pattern; edges counted there that were not added by this change already existed on main (e.g. 129 dict.get-style edges to doctrine.get).
• Coverage of the class: of 2,557 builtin-named alias.name uses where alias is a project module, 2,556 now resolve.
• Deliberate unresolved-over-wrong (14 edges). Against the first version of this change the shadow guard removes 14 edges on that project, all cases where the receiver is a function-local re-import of a different module under the same name or a match capture; 0 of the removed edges were false. A guard that over-matched on keyword args / comprehensions / nested-def parameters / comments (it dropped 185 correct edges) was tightened with regression tests before this PR.
• Known limits: a function-local import other as db of a different module is only caught when the file binds that name to more than one module; case db: captures and exotic rebindings are treated conservatively (unresolved). Remaining unresolved uses on that project are class/annotation/value references (pytest.raises(store.Err), except store.Err, annotations), which are unchanged pre-existing behaviour.

Benchmarks

Index of the 1,544-file project: 45.1 s [42.6–65.4] → 41.4 s [37.6–45.4], peak RSS 3.4 → 3.0 GB, DB 137.7 → 137.9 MB (noise; no regression). An earlier version of the scope check re-blanked the whole file per function and doubled index time (≈51 s → ≈115 s); the memoized per-file scope tree fixed that (final: 41.3 s vs 40.5–41.5 s baseline).

Tests

__tests__/python-module-member-builtin-name.test.ts (8 tests): absolute from pkg import mod; import pkg.mod as m; shadowing by param / with as / assignment / for / except as / lambda; receiver text that only looks rebound (kwarg, comprehension, nested-def param, comment, local import of the same module, lambda elsewhere); rebindings that must stay unresolved (comprehension target equal to receiver on the call's statement, closure over an outer param, annotated and augmented assignment, local import of a different module, match capture). Against plain main, 6 of 8 fail. Python-named suites, frameworks-integration, pr19-improvements: 15 files pass. Full suite: 6,898 passed, 2 failed (bundle-launcher, host lacks zip; same on main).

Relation to existing issues/PRs

• Reconciled with fix(sync): a member reference through an import binding links its module when the module changes #2630 (merged; import-binding retry on sync): that change adds importBindingTail and sync retry bookkeeping around member references; this branch only widens isPythonProjectModule and adds the rebinding guard. No shared helper was duplicated (findPythonModuleFile already existed and is only exported).
• Overlaps in area, not in behaviour: fix(python): resolve imports from the package roots the project has #1921 (open, large: package roots/src layouts for Python import resolution, touches import-resolver.ts and name-matcher.ts) and fix(resolution): resolve Python module members through aliased imports #1453 (open: aliased from pkg import module as alias). Neither addresses the built-in-name filter, so those edges stay dropped even when the import resolves; expect a rebase conflict in import-resolver.ts if fix(python): resolve imports from the package roots the project has #1921 lands first. fix(python): resolve attribute-receiver calls by evidence, never by bare name #1704 (open, attribute-receiver calls by evidence) also touches Python receivers.
• Python: from app import x links to a project variable named app, not the app package #2584 (Python from app import x binding to a variable named app) is a different bug.
• Searched open and closed issues/PRs for "src layout", "python absolute import", "builtin method": none reports this.

Not included

Package-root discovery for src layouts (#1921), aliased from-imports (#1453), class/annotation/value references through a module (mod.Class), exceptions in except.