chore(metrics): fix trailing whitespace and table alignment

Author: josecelano

AGENTS.md

@@ -60,10 +60,10 @@ All packages live under `packages/`. The workspace version is `3.0.0-develop`.
 
 | Package                           | Crate Name                                        | Prefix / Layer | Description                                    |
 | --------------------------------- | ------------------------------------------------- | -------------- | ---------------------------------------------- |
-| `axum-health-check-api-server`    | `torrust-tracker-axum-health-check-api-server`            | `axum-*`       | Health monitoring endpoint                     |
+| `axum-health-check-api-server`    | `torrust-tracker-axum-health-check-api-server`    | `axum-*`       | Health monitoring endpoint                     |
 | `axum-http-tracker-server`        | `torrust-tracker-axum-http-server`                | `axum-*`       | BitTorrent HTTP tracker server (BEP 3/23)      |
 | `axum-rest-tracker-api-server`    | `torrust-tracker-axum-rest-api-server`            | `axum-*`       | Management REST API server                     |
-| `axum-server`                     | `torrust-tracker-axum-server`                             | `axum-*`       | Base Axum HTTP server infrastructure           |
+| `axum-server`                     | `torrust-tracker-axum-server`                     | `axum-*`       | Base Axum HTTP server infrastructure           |
 | `clock`                           | `torrust-tracker-clock`                           | utilities      | Mockable time source for deterministic testing |
 | `configuration`                   | `torrust-tracker-configuration`                   | domain         | Config file parsing, environment variables     |
 | `events`                          | `torrust-tracker-events`                          | domain         | Domain event definitions                       |

docs/issues/open/1669-overhaul-packages/EPIC.md

@@ -234,7 +234,7 @@ Details:
 | SI-05 | [#1797](https://github.com/torrust/torrust-tracker/issues/1797) — Create `torrust-net-primitives` and move `ServiceBinding` from `torrust-tracker-primitives`                    | [docs/issues/open/1797-1669-05-create-torrust-net-primitives-and-move-service-binding.md](../../open/1797-1669-05-create-torrust-net-primitives-and-move-service-binding.md)         | TODO   | Rule M + new package; generic networking type; breaks server-lib → tracker-primitives dep       |
 | SI-06 | [#1813](https://github.com/torrust/torrust-tracker/issues/1813) — Resolve `bittorrent-tracker-core` ↔ `torrust-tracker-rest-api-client` layer violation                          | [docs/issues/closed/1813-1669-06-resolve-bittorrent-tracker-core-rest-api-layer-violation.md](../../closed/1813-1669-06-resolve-bittorrent-tracker-core-rest-api-layer-violation.md) | DONE   | Rule M; stale unused dev dep removed in PR #1804; unblocks `bittorrent-tracker-core` extraction |
 | SI-07 | [#1816](https://github.com/torrust/torrust-tracker/issues/1816) — Align `torrust-` prefix: rename 7 tracker-specific packages to `torrust-tracker-`                              | [docs/issues/open/1816-1669-07-align-torrust-prefix-rename-tracker-specific-packages.md](../../open/1816-1669-07-align-torrust-prefix-rename-tracker-specific-packages.md)           | DONE   | Rule U; none of the 7 are published; pure workspace rename; no blockers                         |
-| SI-08 | [#1819](https://github.com/torrust/torrust-tracker/issues/1819) — Rename `torrust-tracker-metrics` to `torrust-metrics`                                                             | [docs/issues/open/1819-1669-08-rename-torrust-tracker-metrics-to-torrust-metrics.md](../../open/1819-1669-08-rename-torrust-tracker-metrics-to-torrust-metrics.md)                   | DONE   | Rule U; not yet published; no blockers; prerequisite for SI-14                                  |
+| SI-08 | [#1819](https://github.com/torrust/torrust-tracker/issues/1819) — Rename `torrust-tracker-metrics` to `torrust-metrics`                                                          | [docs/issues/open/1819-1669-08-rename-torrust-tracker-metrics-to-torrust-metrics.md](../../open/1819-1669-08-rename-torrust-tracker-metrics-to-torrust-metrics.md)                   | DONE   | Rule U; not yet published; no blockers; prerequisite for SI-14                                  |
 | SI-09 | #TBD — Rename `torrust-tracker-clock` to `torrust-clock`                                                                                                                         | [docs/issues/drafts/1669-09-rename-torrust-tracker-clock-to-torrust-clock.md](../../drafts/1669-09-rename-torrust-tracker-clock-to-torrust-clock.md)                                 | TODO   | Rule P; published on crates.io; no blockers; prerequisite for SI-13                             |
 | SI-10 | #TBD — Rename `torrust-tracker-located-error` to `torrust-located-error`                                                                                                         | [docs/issues/drafts/1669-10-rename-torrust-tracker-located-error-to-torrust-located-error.md](../../drafts/1669-10-rename-torrust-tracker-located-error-to-torrust-located-error.md) | TODO   | Rule P; published on crates.io; no blockers                                                     |
 | SI-11 | #TBD — Update all package READMEs                                                                                                                                                | [docs/issues/drafts/1669-11-update-all-package-readmes.md](../../drafts/1669-11-update-all-package-readmes.md)                                                                       | TODO   | Documentation; requires SI-07–SI-10; before SI-12                                               |

packages/metrics/README.md

@@ -105,7 +105,7 @@ The library uses Rust's type system to ensure metric safety:
 // Counter operations return u64
 let counter_sum: Option<u64> = counter_collection.sum(&name, &labels);
 
-// Gauge operations return f64  
+// Gauge operations return f64
 let gauge_sum: Option<f64> = gauge_collection.sum(&name, &labels);
 
 // Mixed collections convert to f64 for compatibility
@@ -117,7 +117,7 @@ let mixed_sum: Option<f64> = metric_collection.sum(&name, &labels);
 ```output
 src/
 ├── counter.rs             # Counter metric type
-├── gauge.rs               # Gauge metric type  
+├── gauge.rs               # Gauge metric type
 ├── metric/                # Generic metric container
 │   ├── mod.rs
 │   ├── name.rs            # Metric naming