fix(core): restore Sidecar public export + sidecar-client subpath

[abcxff]

What

@secure-exec/core was renamed internally (sidecar-client.ts → sidecar-process.ts, class Sidecar → SidecarProcess) but the public surface wasn't updated, so on main:

• @secure-exec/core no longer exports Sidecar (only SidecarProcess)
• the ./sidecar-client export still points at the now-nonexistent dist/sidecar-client.js (the source builds to dist/sidecar-process.js)

Consumers that import Sidecar / @secure-exec/core/sidecar-client (the secure-exec facade, the native-client example, and @rivet-dev/agentos-core) fail to build with TS2305 / TS2307.

Fix (3 small edits, no consumer changes)

• sidecar-process.ts: export { SidecarProcess as Sidecar }
• index.ts: also export Sidecar from the package root
• package.json: repoint the ./sidecar-client export to ./dist/sidecar-process.{js,d.ts}

sidecar-process.ts already re-exports the full prior sidecar-client surface (SidecarProcessError, SidecarProcessExited, SidecarEventBufferOverflow, the types), so the public API is preserved exactly.

Verification

With this change, @secure-exec/core builds, the secure-exec facade builds, and the native-client example typechecks clean.

🤖 Generated with Claude Code

[railway-app]

🚅 Deployed to the secure-exec-pr-112 environment in rivet-frontend

Service	Status	Web	Updated (UTC)
secure-exec	😴 Sleeping (View Logs)		Jun 22, 2026 at 9:21 pm

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🚅 Deployed to the secure-exec-pr-112 environment in secure-exec

Service	Status	Web	Updated (UTC)
secure-exec	😴 Sleeping (View Logs)	Web	Jun 24, 2026 at 7:22 pm