compile: build-time defines (--define, Bun.build semantics) and the no-define fallbacks OpenCode relies on (import.meta.resolve, new URL(..., import.meta.url)) #10101

Parent: #10107.

Problem

packages/opencode/script/build.ts:191-201 injects eight compile-time constants with Bun.build define. Perry has no define mechanism (no --define, no perry.json key). Every constant is typeof-guarded, so the source still compiles, but each fallback must then work and the product identity is wrong:

import.meta.resolve is lowered to undefined by perry (crates/perry-hir/src/lower/expr_member.rs:270-280: only url/main/dirname/filename/require are known), so the OTUI fallback throws undefined is not a function, and packages/core/src/npm.ts:53 import.meta.resolve(name, dir) (Bun's two-argument form, used to locate runtime-installed npm plugins/providers) silently yields no entrypoint.

Scope

1. Add --define NAME=<json-or-identifier-expr> (repeatable) and perry.json "define": { … }, with Bun.build semantics: identifier replacement at parse/lower time, typeof NAME folding, dotted keys (process.env.X), string values are JS expressions (Bun passes JSON.stringify(...) for strings). Include the define map in build and object-cache keys (like PERRY_LL_SIZE_OPT per perf(compile): reduce generated bundle bloat #8418).
2. import.meta.resolve(specifier[, parent]): static specifier → the compile-time resolved file:// URL of that module/asset (works for @opentui/core/parser.worker and web-tree-sitter/tree-sitter.wasm); dynamic specifier → runtime resolver against the given parent directory/URL (needed by core/src/npm.ts:53 for ~/.cache/opencode/node_modules/<pkg>), returning a file:// string, throwing like Bun on failure.
3. Verify new Worker(new URL("../tui/worker.ts", import.meta.url)) is discovered as a worker entry (a test already covers new URL("./web-worker.ts", import.meta.url), crates/perry/tests/issue_worker_threads_cross_thread_delivery.rs:196) — see AOT/runtime: verify the three Worker entrypoints of OpenCode v1.18.30 end-to-end (TUI server worker, OpenTUI parser worker, thread-stream) #10103.
4. Harness: supply the eight defines exactly as script/build.ts does (version from packages/opencode/package.json, channel latest, models snapshot via script/generate.ts, worker paths pointing at the compiled worker entries, libc flags).

Acceptance

• perry compile --define OPENCODE_VERSION='"1.18.30"' … → opencode --version prints 1.18.30; without the define prints local.
• typeof OPENCODE_MODELS_DEV === "undefined" folds to a constant with and without the define; the models.dev runtime fetch path runs when undefined.
• import.meta.resolve("@opentui/core/parser.worker") returns a usable file:// URL in the native binary; import.meta.resolve("x", "/tmp/dir") resolves /tmp/dir/node_modules/x at runtime.
• Object cache invalidates when a define value changes.