chore: upgrade eve to 1.0.0-rc.0

Why

Upgrade this gallery template to eve 1.0.0-rc.0.

Gallery: https://vercel.com/templates/eve/eve-software-factory

Migrations

• Updated eve and its required compatible peers, plus the latest published GitHub eve extension.
• Preserved the 75% compaction threshold and 100,000 output-token session budget using 1.0 configuration.
• Moved workflow station delegation to ctx.agent().send() and return only validated structured station output.
• Migrated eval helpers and stream consumers from v26 event names and input-request APIs to v27 calls, children, and interactions.

Validation

• Passed: pnpm typecheck
• Passed: pnpm check
• Attempted with harmless placeholder configuration: eve build --skip-sandbox-prewarm and pnpm validate
• Not run: live model evals, per the upgrade request.

Blocker

Discovery/build is blocked by the latest published @github-tools/eve-extension@0.9.0: its distribution manifest is still epoch-based, and eve 1.0.0-rc.0 rejects it. No compatible extension distribution or prerelease tag is published. This PR deliberately does not bypass that release gate.