fix(eve): deliver subagent.called events to hooks

[NicoMoli]

Summary

Closes #2223. Parent subagent.called events reached the stream but bypassed authored hooks in plain and task dispatch modes. The shared emitter now sends the same stamped event to the stream and hooks inside the framework context, while logging post-start failures to prevent child dispatch replay.

Validation

Focused dispatch and hook lifecycle integration coverage passes (31 tests), along with eve package typecheck, formatting, lint, invariant, and docs checks. The full unit run reached 6,619 passing tests but could not complete because generated #compiled modules were unavailable locally and the sandbox blocked one port-binding test; CI will cover the complete suite.

Checklist

• This change was requested or approved by a maintainer
• I ran the relevant checks from CONTRIBUTING.md
• I added tests and documentation where relevant
• I added a changeset if this touches the published eve package
• DCO sign-off passes for every commit (git commit --signoff)

Diff size

Docs — 2 files · +8 / -1

Documents subagent.called delivery and its replay-safe failure behavior, with the required patch changeset.

Implementation — 3 files · +66 / -44

Keeps the lifecycle change in the shared emitter and threads provider-committed session state through both callers.

Tests — 1 file · +114 / -24

Uses a real context container to cover both dispatch modes, event identity, provider commits, and the throwing-hook replay boundary.

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