JBZoo / Mermaid-PHP

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feat: add Sequence Diagram support (#10) (#33)

## Summary

Adds first-class Mermaid `sequenceDiagram` support to the library,
following the same fluent, object-oriented style as the existing
`Graph`/`Timeline` families. Requested in #10.

A sequence diagram is modeled as an **ordered stream of statements with
nesting** (not two flat sets like `Graph`). A tiny `Statement` interface
(`render(int $shift): string`, extends `\Stringable`) is implemented by
every body element; participants/boxes form a header region; the
`SequenceDiagram` container renders header + ordered body and plugs into
the existing `Render`/`Helper` machinery.

## What's covered (full `sequenceDiagram` syntax)

- **Participants / actors** — aliases, `safeMode` (md5 ids, like
`Node`), repeatable per-participant `link()`
- **Messages** — all 10 arrow types, inline activation (`+`/`-`,
mutually exclusive) and explicit `activate`/`deactivate`
- **Notes** — `left of` / `right of` / `over` (one or two participants)
- **Lifecycle** — `create` / `destroy`; **comments** (`%%`)
- **Boxes** — participant grouping with optional color
- **Control blocks** — `loop`, `opt`, `break`, `rect` (single-section)
and `alt`/`else`, `par`/`and`, `critical`/`option` (multi-section),
arbitrarily nestable
- **Container** — title frontmatter, `autonumber`, `getParticipant()`,
`addMessageByIds()` (throws on unknown id), `renderHtml()`,
`getLiveEditorUrl()`

## Notes

- The `break` block class is named **`BreakBlock`** — `break` is a
reserved word in PHP, so `class Break` is a parse error. It still emits
the Mermaid `break` keyword.
- `Render::html()` / `Helper::getLiveEditorUrl()` union types widened to
accept `SequenceDiagram`.
- README updated with the new diagram type and a runnable example.

## Testing

- `tests/SequenceDiagramTest.php`: 23 tests, 58 assertions — every arrow
type, activation, notes, lifecycle, comments, boxes/links, all blocks +
nesting, container ordering, `addMessageByIds` errors, and an ... (continued)

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