feat(checker): BSK-E0153 constructor-to-callable conversion (conformance constructors_callable PASS)

[MelbourneDeveloper]

TLDR

Adds checker rule BSK-E0153 implementing the typing-spec "Converting a constructor to callable" rule, flipping the constructors_callable.py PEP conformance file to PASS (suite 135→136/146, 93.15%).

What Was Added?

• crates/basilisk-checker/src/rules/e0153.rs — ConstructorCallableMisuse rule. When a class object flows through an identity-over-callable function (def f(cb: Callable[P, R]) -> Callable[P, R]), the bound variable inherits the class's constructor-to-callable signature, and calls to it are validated. Signature derivation priority: metaclass __call__ → __new__ (when it returns a non-Self/non-class type, e.g. -> int/-> Proxy/-> Any, so __init__ is ignored) → __init__ → empty. Detects: too few / too many positional args, unknown keyword names, and inconsistent list[T] TypeVar bindings. Conservative: starred/**kwargs unpacking suppresses arity checks.
• crates/basilisk-checker/tests/e0153_tests.rs — 8 e2e tests (invalid calls, valid calls, metaclass passthrough, __new__-controls, float/bytes element conflict, heterogeneous list, plus isolation guards: non-identity wrappers and direct class aliases must NOT fire).
• shared::method_name_map() — shared (class, method) → Vec<&FunctionInfo> builder.

What Was Changed or Deleted?

• Registered e0153::ConstructorCallableMisuse in the rule registry.
• DRY: migrated e0041, e0074, e0111, e0144 to shared::method_name_map, deleting 4 copies of the identical inline method-map builder.
• Ratcheted the conformance threshold 92 → 93 in coverage-thresholds.json (now 136/146 = 93.15%).
• Regenerated conformance/conformance_status.csv (constructors_callable.py → PASS, 12 caught / 0 missed / 0 FP).

How Do The Automated Tests Prove It Works?

• e0153_tests: 8 tests pass — e.g. invalid_calls_emit_e0153 asserts exactly 4 diagnostics ("missing required argument x", "Unexpected keyword argument y", "too many positional argument", "Inconsistent binding for type variable T"); valid_calls_do_not_emit_e0153, metaclass_call_accepts_any_arguments, and non_identity_wrapper_is_not_tracked assert zero diagnostics.
• conformance_score: gate prints 93% (136/146) >= 93% threshold — PASS; constructors_callable.py now caught=12, missed=0, and the suite-wide false-positive total is unchanged at 170 (zero new FPs).
• Coverage: basilisk-checker at 94% ≥ 93%; all crate thresholds met; full workspace test suite green. cargo clippy --workspace --all-targets -D warnings and cargo fmt --check clean.

Spec / Doc Changes

• docs/specs/CHECKER-ARCHITECTURE-SPEC.md: new section {#CHKARCH-DIAG-CTOR-CALLABLE} + BSK-E0153 reference-table row (code/tests cross-reference this spec ID).
• website/src/docs/rules/index.md + zh/ mirror: added BSK-E0153 row.
• docs/plans/CHECKER-PEP-CONFORMANCE-PLAN.md: score updated to 136/146; constructors_callable.py marked done.

Breaking Changes

• None — additive rule; only fires on the narrow constructor-to-callable pattern (verified no other conformance file or extension fixture triggers it).