feat(core): add location-scoped operation hooks

[filipeforattini]

Summary

• add a Location-scoped operation hook registry with waterfall, serial, and parallel dispatch for Effect and Promise V2 plugins
• migrate agent, command, compaction, permission, text, tool, and turn lifecycle call sites while preserving V1 tool ordering
• centralize pre/post execution around registry tools, MCP resources/tools, and structured output, including failure observation
• restore schema event-manifest coverage and V1 import isolation

Testing

• pre-push workspace typecheck: 30 packages passed
• bun test test/operation-hook.test.ts test/plugin.test.ts test/plugin/promise.test.ts in packages/core: 15 passed
• focused operation-hook integration, snapshot race, processor, provider transform, and schema suites: 442 passed
• package typechecks passed for core, plugin, schema, opencode, tui, and sdk/js
• git diff --check passed

Known baseline

• bunx changeset status identifies the intended opencode minor bump, then reports the existing vendored @opencode-ai/client version mismatch in app/session-ui.
• full local prompt shell tests exceed their 5-second timeout because this machine’s login shell startup takes about 8.4 seconds; the focused operation-hook prompt integration passes.

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