chore: upgrade Effect to rc.115

[kitlangton]

Why

OpenCode was pinned to Effect 4.0.0-rc.112, while the current V4 release candidate is rc.115. Moving forward requires adopting breaking changes in socket lifecycle APIs, schema parsing, CLI constructors, filesystem sizes, and network addresses without regressing existing behavior.

What Changes

• upgrades the aligned Effect package set from rc.112 to rc.115
• migrates sockets from callback-based runs to scoped pull readers and structured writers across the recorder, PTY handlers, and SSH askpass flow
• preserves unknown persisted fields during legacy schema migration after removal of onExcessProperty: "preserve"
• adopts the renamed CLI/config constructors, shared network address model, ByteSize, and native Effect arbitrary API
• makes fast-check an explicit test dependency for the remaining custom state-machine properties
• aligns the summary resize E2E with the current fixed translation range

Socket Lifecycle

Socket acquisition now owns the connection scope. Readers pull non-empty frame batches, writers expose write/writeAll, and clean closes are handled explicitly where the previous callback runner treated them as completion.

Scope

This PR contains the Effect upgrade, its required compatibility changes, and one correction to an existing E2E expectation; it does not intentionally change user-facing behavior.

Verification

bun run check

# packages/core
bun run test test/config/config.test.ts test/config/normalization.test.ts test/state-replay.test.ts test/tool-registry.test.ts

# packages/desktop
bun run test src/main/ssh/askpass.test.ts src/main/ssh/controller.test.ts src/main/files/attachment-picker.test.ts

# packages/http-recorder
bun run test test/websocket.test.ts

# packages/cli
bun run test test/service.test.ts test/ssh-askpass.test.ts
bun run src/index.ts --help >/dev/null

# packages/server
bun run test test/pty-socket.test.ts test/persistent-pty.test.ts

# packages/httpapi-codegen
bun run test

# packages/ai and packages/codemode
bun run test

# packages/client
bun run check:generated

# packages/app
PLAYWRIGHT_BUILD=1 bunx playwright test e2e/regression/session-summary-layout.spec.ts --grep 'slides' --workers=1

Full lint and type-check passed across all 35 tasks. Focused suites passed: core 109 tests, desktop 17 tests, HTTP recorder 12 tests, CLI 20 tests, server 1 test with 3 environment-dependent skips, HTTP API codegen 97 tests, AI 1,401 tests with 28 skips, CodeMode 1,282 tests, generated-client validation, and the two summary-layout E2E variants.