jyablonski / arc / 27114264255

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chore: standardize structured table formatting (#22)

## Description

Consolidate all structured-text table output behind a single canonical
renderer so every command reads like `arc ai tokens` (lowercase headers,
per-column underline rule, aligned columns) instead of each command
formatting tables its own way.

### Updated

- Rewrote `output.Table` as the one canonical renderer; added
`output.TableLines` and `output.FprintTable`. Headers are lowercased in
the renderer so the format can't drift per-caller.
- Pointed `ai/presentation` history/ROI tables at `output.Table` and
deleted the duplicate private renderer.
- Routed `skills list` through the canonical renderer, which also fixed
a latent bug where the table ignored the passed `io.Writer` and always
wrote to stdout.

### Deleted

- Private `printAlignedTable`/`alignedTableLines` in `ai/presentation`
and the legacy `tabwriter`-based `output.Table` body.

> Note: all table headers are now lowercased (e.g. `rules status`
columns went `PROVIDER/TARGET/STATUS` -> `provider/target/status`), a
user-visible change across every table command.

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