namir-clap: set_size returns Ok while the plugin is not resizable and ignores the request

[ErwanLegrand]

crates/namir-clap/src/gui.rs:192-198

set_size returns Ok(()) while can_resize() is false and get_size keeps returning the 960x640 constants, so a host that calls it anyway is told the resize succeeded when nothing changed.

Fix: return Err to match what the plugin actually does.

[ErwanLegrand]

Partial. The local decision is fixed; the refusal cannot reach a host with clack 0.1.1.

Landed (63afed5, 1864c12): set_size returns Err(PluginError::Message("this editor is a fixed size (can_resize() is false)")) for every size but the current one (crates/namir-clap/src/gui.rs:234-241). The exact current 960x640 is still accepted, since a host echoing get_size back must not be told the plugin cannot hold the size it just reported; the decision is factored into accepts_size so it is testable independently of the ABI.

Remaining, upstream: clack-extensions 0.1.1's set_size trampoline (src/gui/plugin.rs:403-412) is PluginWrapper::handle(plugin, |p| Ok(p.main_thread().as_mut().set_size(size))).is_some() — it wraps the plugin's whole Result as the closure's success value, so an Err still yields true at the C ABI. Its siblings (set_scale, show, hide, set_parent) are all Ok(...is_ok()), so it is a one-function defect. Tracked in #144 and reported as prokopyl/clack#101. Nothing here can close it: crates.io publishes only 0.1.0 and 0.1.1, and Cargo.toml's "0.1.1" is a caret requirement held by the lockfile, so a released 0.1.2 arrives via cargo update.

a_refused_set_size_changes_nothing_and_clack_0_1_1_swallows_the_refusal (crates/namir-clap/tests/clap_host_gui.rs:443) asserts the swallowing from the host side, so a fixed trampoline turns this red with a message telling the reader to flip the assertion.

One stale detail worth correcting in the tree: gui.rs:218-220 still reads "Upstream status (issue #144, as of 2026-08-30): not reported... there is no upstream ticket to track". #144 now records clack#101 as filed.

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