refactor(agent-core): rename micro compaction telemetry event to micro_compaction_finished

[7Sageer]

Depends on #845. This PR is stacked on top of #845. Until #845 is merged, the diff and commit list will also include the commits from #845; they will drop out automatically once #845 lands on main.

Related Issue

No related issue.

Problem

The telemetry events for the two compaction paths use inconsistent verbs: full compaction emits compaction_finished / compaction_failed, while micro compaction emitted micro_compaction_applied. The mixed applied vs finished wording makes the two paths harder to discover and compare.

What changed

Renamed the micro compaction telemetry event from micro_compaction_applied to micro_compaction_finished, so both compaction paths now follow the same <kind>_compaction_finished convention.

Full compaction's compaction_finished / compaction_failed are intentionally left untouched. The records.logRecord entry (micro_compaction.apply) is also left as-is, since it is an internal replay record rather than a telemetry event.

Note: this is a telemetry event rename. Micro compaction is still gated behind the experimental micro_compaction flag (disabled by default), so the data footprint of the old event name is small.

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue, or explained the problem above.
• I have added tests that prove my feature works.
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update.

[changeset-bot]

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Latest commit: 34461b8

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commit: 34461b8