docs: fix Microsoft.Foreign hits (e.g./i.e. -> for example/that is)

Substitutes 'for example' for 'e.g.' and 'that is' for 'i.e.' per
Microsoft style, with no comma after the replacement -- this repo
never puts a comma after e.g./i.e. either, so the substituted phrase
matches that house style instead of vale's literal 'for example,'
suggestion.

Covers all 77 real hits (72 from the initial vale pass + 5 more of the
same pattern found on a follow-up vale run). None of the flagged
instances were sentence-initial, so there's no capitalization concern
here.

Verified via a fresh vale run: 0 remaining Microsoft.Foreign hits.
Full accounting in /agents/iris/state/haiku-batches/foreign-report.md.

docs/scheduler/observability.md

@@ -199,7 +199,7 @@ automatically:
 | Attribute      | Value                                                        |
 | -------------- | ------------------------------------------------------------ |
 | `service.name` | `hyperhive-agent` (constant)                                 |
-| `agent`        | agent logical name (e.g. `iris`)                             |
+| `agent`        | agent logical name (for example `iris`)                      |
 | `hive`         | hive display name (`services.hyperhive.hiveName`)            |
 | `swarm`        | swarm display name (`services.hyperhive.swarm.name`, if set) |
 
@@ -330,7 +330,7 @@ Agents can push arbitrary labeled metrics to the same OTEL collector via the
 hive-metric <name> <value> [--type counter|gauge] [--temporality delta|cumulative] [--labels key=value...]
 ```
 
-- `<name>` — metric name (e.g. `tasks_completed`, `latency_ms`).
+- `<name>` — metric name (for example `tasks_completed`, `latency_ms`).
 - `<value>` — numeric value (f64; integers and floats both accepted).
 - `--type counter|gauge` — metric kind: `counter` (increasing sum, default) or
   `gauge` (instantaneous point-in-time value).