fix(rvf-wasm): publish as ESM-only to resolve #415

[ruvnet]

Summary

• Fixes @ruvector/rvf-wasm@0.1.6 is unloadable: pkg/rvf_wasm.js mixes ESM syntax (import.meta, export default) into CJS-classified file #415 — @ruvector/rvf-wasm@0.1.6 was unloadable because pkg/rvf_wasm.js used import.meta.url and export default while package.json had no "type": "module", so Node parsed it as CJS and threw SyntaxError: Cannot use 'import.meta' outside a module before any runtime guard could execute.
• This breaks every downstream agentdb / @claude-flow/memory / ruflo operation that touches the RVF backend (memory init, hooks pretrain, status, …).

Fix

• Add "type": "module" and switch main → pkg/rvf_wasm.mjs.
• Drop the require/default exports that pointed at the broken CJS-classified .js. Node 22.12+ supports require(ESM) natively, so a single ESM entry covers both consumers.
• Add tests/smoke.mjs regression guard (also wired into prepublishOnly) that imports the package, calls init(), asserts real WASM memory, and confirms idempotency.
• Bump 0.1.5 → 0.1.7 (skip the broken 0.1.6).

Proof

End-to-end against a packed tarball installed into /tmp on Node 22.22.2:

$ npm pack
ruvector-rvf-wasm-0.1.7.tgz

$ node --input-type=module -e "import('@ruvector/rvf-wasm').then(m => m.default()).then(e => console.log('memory bytes:', e.memory.buffer.byteLength))"
memory bytes: 1179648

$ node -e "require('@ruvector/rvf-wasm')"
# succeeds (Node 22.12+ require(ESM))

$ npm test
  ok: mjs default export is a function
  ok: init() returned exports object
  ok: exports.memory is WebAssembly.Memory
  ok: init() is idempotent

rvf-wasm smoke OK

Test plan

• npm pack succeeds; tarball contents unchanged (6 files, 21 KB).
• ESM await import('@ruvector/rvf-wasm') resolves and default() returns real WASM exports.
• CJS require('@ruvector/rvf-wasm') works on Node 22.12+ (no SyntaxError).
• npm test passes (tests/smoke.mjs).
• prepublishOnly runs the smoke test before any future publish.
• Manual: re-run ruflo memory init against a stack pinning @ruvector/rvf-wasm@0.1.7 once published.

Notes

• Local consumers (@ruvector/rvf ^0.1.5, @ruvector/rvlite >=0.1.0) are unchanged — both already use await import('@ruvector/rvf-wasm'), which now works.
• Workaround in the issue (sed-patching installed package.json) is no longer needed once 0.1.7 is published.
• This PR does NOT publish — version bump is in-tree only; release pipeline owns the actual npm publish.

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