fix(codegen): extend type resolution for call/method chains

[cs01]

User impact

More patterns that used to silently read garbage or fail LLVM IR compilation now work correctly:

• `const last = fn()[i]; last.field` where `fn()` returns an interface array
• `const inner = obj.method().field; inner.nested` where `obj.method()` returns an interface with a nested interface field

Context

Part of an ongoing effort to plug gaps in ChadScript's fragmented type-resolution layer. CLAUDE.md rule: ObjectArray element access loses type info. PR #522 added method-call indexed access; this PR extends to free-function indexed access AND `member_access where the object is a method_call or call`.

Change

• `array-allocator.ts getIndexedObjectArrayType` — add `call` branch (free function) using AST function lookup, mirroring the existing `method_call` branch.
• `variable-allocator.ts getMemberAccessInterfaceType` — add `method_call` and `call` branches, resolving the method/function return type and looking up the property's interface type. Previously only handled `variable` objects.
• `tests/fixtures/interfaces/fn-returning-array-indexed.ts`, `tests/fixtures/interfaces/method-return-inner-interface.ts` — regression fixtures.

Fuzz results

Running a 20-case fuzz corpus against the compiler:

• Before: 8/20 pass
• After fix(codegen): method-call indexed access loses interface type (root cause for A2-A5 segvs) #522: 9/20 pass
• After this PR: 10/20 pass

Remaining 10 gaps (for future PRs): `.filter()[i]`, `.map(f)[i]`, array-literal indexed, `grid[i][j]`, `arr.find()`, `arr.sort()`, chained inline `x.method().inner.v`, etc.

Test plan

• `npm run verify` green (tests + stage 1 + stage 2)
• 2 new regression fixtures

[github-actions]

Benchmark Results (Linux x86-64)

Benchmark	C	ChadScript	Go	Node	Place
Binary Trees	1.158s	1.018s	2.080s	1.017s	🥈
Cold Start	0.8ms	0.7ms	1.0ms	23.9ms	🥇
Fibonacci	0.705s	0.706s	1.343s	2.611s	🥈
File I/O	0.070s	0.075s	0.070s	0.147s	🥉
JSON Parse/Stringify	0.003s	0.004s	0.013s	0.011s	🥈
Matrix Multiply	0.380s	0.394s	0.600s	0.443s	🥈
Monte Carlo Pi	0.341s	0.348s	0.355s	2.011s	🥈
N-Body Simulation	1.387s	1.747s	1.777s	1.844s	🥈
Quicksort	0.191s	0.218s	0.188s	0.224s	🥉
SQLite	0.253s	0.273s	—	0.331s	🥈
Sieve of Eratosthenes	0.011s	0.021s	0.016s	0.033s	🥉
String Manipulation	0.006s	0.016s	0.013s	0.030s	🥉

CLI Tool Benchmarks

Benchmark	ChadScript	grep	node	xxd	Place
Hex Dump	0.338s	—	0.784s	0.109s	🥈
Recursive Grep	0.017s	0.009s	0.080s	—	🥈