[ako]

Syncs ako/mxcli:main into upstream: 29 commits since #1739 — new microflow and page statements, describe round-trip fixes, and syntax/check accuracy.

Microflows: OData write flows

• New: send external object / delete external object. Studio Pro's "Send external object" and "Delete external object" had no MDL; a plain commit on an external entity is a Studio Pro error, so OData write flows could not be authored, and describe printed -- Unsupported action.

  send external object $Obj [refresh] [on error ...];
  delete external object $Obj [refresh] [on error ...];
  

  The writer produces Studio Pro's property set (checked against Studio Pro 11.16-authored activities), describe round-trips them, and on error continue is refused as MDL076 (CE6035, measured on mxbuild 11.12.6). Either one in a nanoflow is MDL091 (CE0009). Gated at 9.7.0 / 9.12.0.
• A drop + create that would lose an activity MDL cannot express is refused. Such an activity is described as a comment, so the rebuild MDL-V1-REBUILD recommends wrote the flow without it and reported success. check -p, exec's pre-flight and the rebuild path now refuse it, naming the activities; the splice path already kept them.

Fixes #1735

Microflows: authoring

• New: a queued call's retry policy — in queue … retry fixed|exponential, every property required. describe prints a stored retry so it round-trips, check refuses Retries 0 (CE7044), and a rewrite that keeps a queued call but drops its stored retry is refused on both the rebuild and the splice path. A flow carrying a retry was locked for MDL before. Fixes Feature: author the retry policy of a queued call (in queue … retry fixed|exponential); a flow with a retry is locked for MDL today #1729
• retrieve … offset n without a limit keeps its offset. It was written as the "all" range, so the retrieve returned the first objects instead of skipping, and describe printed no offset. Fixes DB retrieve with offset cannot be generated #1737
• database from $ctx/… resolves multi-hop paths through the same function as an association source, so the short A1/A2 form is accepted and an entity off the association is no longer written as a hop's destination. A hop whose association does not start at the context entity (or a generalization) is refused, by check as MDL-ASSOCDS03 when provable.

Microflows: describe round-trips

• A decision whose branch ends the flow keeps one merge on describe → drop + create; each round trip added another (join junctionN; merge junctionN;). Fixes DESCRIBE → drop + create adds a merge to a decision one of whose branches ends the flow — one more on every round trip #1727
• A note linked to the start event or to another note is described (it was dropped, and a re-exec deleted it). The link itself has no MDL form; a -- WARNING says a rewrite drops it. Fixes annotations not linked to an activity are missing in MDL #1731
• A blank call external action argument prints as = nothing, not name = ), which did not parse and made every mdl 1; rewrite of the microflow refused.
• A text holding $$ is described as a string literal, not a $$ … $$ block it would end early (JSON structure samples, Java/JavaScript action bodies, agent prompts, data transformer steps).
• The flow warnings now cite mendixlabs/mxcli#923 by owner.

Pages

• A Data grid 2 control-bar Delete button deletes the grid's selection: delete $grid1 [close page]. MDL had no spelling, the writer never set SourceVariable (CE7005), and describe printed it as plain delete. A bare delete in a control bar or outside every data widget is now refused as MDL-PAGEDEL01. Fixes Data grid 2 control-bar Delete button: MDL cannot set its source (the grid selection) and describe drops it; action: delete passes check but fails mx check with CE7005 #1730
• An AccessibilityHelper's described attributesList re-executes — its items were read as attribute bindings without a data container.

check and lint

• MPR008 names the loop when a loop's box overlaps a neighbour, with the minimum gap, instead of asking for @positions already there. Fixes MPR008: name the loop box as the cause when a loop overlaps its neighbours, or let layout place loops #1690
• No false MDL-WIDGET10 on text/number/date filter Attributes (check evaluated an attrChoice exec never writes), and a regression test for dynamictext Content, already fixed by Native mobile widget packages take over the built-in image and radiobuttons keywords on web pages #1463. Fixes False MDL-WIDGET10 on dynamicText Content #1707
• Warns when toString of a Decimal is written to a short String attribute (minutesBetween/div results overflow String(n) on commit though the build accepts them). This is the Decimal part of the issue only. Refs check passes expressions the build rejects or that misbehave at runtime (function arguments, Decimal toString, raw backslash literals) #1515
• Message definitions: describe names the referenced attribute after a rename (stored exposed name as as '…'), so its output execs again; check --references refuses a member naming an attribute the entity lacks. Fixes Message definition: after RENAME ATTRIBUTE, describe prints the member under the old attribute name; the output passes check but fails on exec ("has no attribute") #1733
• A malformed argument in a data-source parse error is named with its own line:column.

mxcli syntax

• Every built-in expression function with its types, rendered from the type checker's signature table (isNew, add*/subtract*, trimTo* were missing). Fixes mxcli syntax expression lacks isNew, addMonths and the trimTo functions #1708
• A drop topic documenting every DROP statement, held to the grammar by a drift test. Fixes DROP ASSOCIATION not well documented in mxcli syntax #1716

Studio Pro MCP

• A localhost URL dials 127.0.0.1 first (then the resolver, then host.docker.internal), Host header unchanged — Studio Pro on Windows listens on 127.0.0.1 only, so --mcp-dial is no longer needed.
• The report that exec --mcp / -c --mcp write the .mpr does not reproduce on main; a test now pins it through main() against a locked project, and fails with the report verbatim when the fault is forced back in.

Fixes #1684

brain

• plan and check answer "nothing is built" when the .mpr does not exist yet, instead of failing with "mpr file not found".

Docs

• Proposal for include associations ( … ) on a call external action argument. Refs CALL EXTERNAL ACTION — no MDL syntax for IncludeAssociations flag #1721
• The check-syntax skill's forward-reference rule is corrected; page-patterns Delete buttons use delete $grid