docs(intent): sync AI assistant guide with the parser implementation

[iliyan-velichkov]

What

Reconciles components/engine/engine-intent/src/main/resources/intent-assistant-guide.md — the system prompt that powers the Intent Editor's AI assistant — with what IntentParser actually accepts. The parser + model POJOs are the single source of truth.

Why

The guide had drifted from the implementation in a few places, most notably claiming the calendar family was "reserved / not yet available" when it ships and is accepted by validateViews. Since this file is the assistant's system prompt, drift here directly degrades the suggestions users get in the editor.

Changes

• Fix Calendar. view: calendar | range | slots, the calendar: / slots: config blocks, and function: Calendar are fully implemented (IntentParser.validateViews, CalendarIntent, SlotsIntent). Corrected the reserved-values note: the entity functions that are recognised-but-rejected are Board / Gantt / Timeline.
• Add a "views - calendar, range, and slots" section documenting the calendar: block (start/end/title/color/scope/initialView) and the slots: block (start/open/close/step/disabledDays), plus the embedded-calendar-in-detail-pane behaviour for composition children.
• Document assignee: personal on user tasks (routes the task to the record owner's Inbox; requires a personal: relation — the parser rejects it otherwise).
• Document field aggregate: true (document totals footer).
• Document scheduled generate.children (per-matched-row fan-out, e.g. a day row per working day).
• Extend the Allowed-values table with the entity/field/relation function, entity view, report kind/chart/widget.kind, custom-widget kind, rollup op and expansion unit enums.

Verification

Every added/changed statement was checked against IntentParser.java and the model/*.java POJOs (enum sets, validateViews, validateTaskFormActions for assignee: personal, CalendarIntent/SlotsIntent field names and defaults). Content-only change to a classpath Markdown resource; no code paths affected.

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