[ZhukMax]

What

1. efx_ctx! was broken on v0.7 (efx/src/input.rs)
EfxCtxInput::parse consumed the comma between ctx and the template, then the struct literal's _comma: input.parse()? tried to read a second comma after the template. Every efx_ctx!(ctx, "...") call failed with expected `,` — efx-sandbox did not compile on v0.7. Fix: drop the _comma field.

2. Failing trybuild case tests/ui/unknown_tag.rs
Since unknown tags now go through the .efx component lookup, the error text had changed. The message now explains the lookup and stays machine-independent (no absolute paths):

efx: unknown tag <WAT>: not a built-in tag, and no component file `WAT.efx` found in `$EFX_UI_PATH` or `src/ui/`

.stderr re-blessed with TRYBUILD=overwrite.

3. Regression tests

• efx/tests/ctx_ok.rs — renders Window, TopPanel, CentralPanel via efx_ctx! against a real egui::Context (inside ctx.run), plus a call with an expression ctx (&app.ctx). Verified it fails without the fix.
• efx/tests/ui/ctx_non_root.rs — compile error when the root is not a context-root tag.

4. Housekeeping — rustfmt on efx-core/src/component.rs and a collapsed nested if (clippy collapsible_if); it was the first clippy error and hid the rest.

5. AGENTS.md (separate commit) — guide for AI agents and contributors: codegen architecture, commands and CI state, branch policy, tag checklist, syntax as actually implemented, verified known issues, roadmap, and a promotion section with a dated baseline.

6. Clippy-clean v0.7 (third commit)

• Library: removed never-read element fields (+ their clones) from Image, Table, Tabs, DataTable; data_table.rs lints (question_mark, needless_borrow, useless_conversion, let_and_return).
• Generated code no longer triggers lints in the user's crate — these fired on every call site, so anyone running clippy -D warnings on an app using EFx hit them:
  • trailing () in Window / CentralPanel / TopPanel / BottomPanel / SidePanel and efx_ctx! expansions → clippy::unused_unit;
  • Button / Image rounding emitted deprecated egui::Rounding / .rounding() → now corner_radius(CornerRadius::same(..));
  • non-root <Button> / <Hyperlink> left a #[must_use] Response unused → now let _ = ….
• New test: efx_ctx! evaluates to () for all five context roots (guards the () removal).
• efx-sandbox: counter field is now displayed (was dead code). Changelog entries under 0.7.

Verification (rustc/clippy 1.99.1)

• cargo test --all-targets --all-features — green (same as test.yml), incl. trybuild and doctests
• cargo clippy --all-targets --all-features -- -D warnings — green (same as clippy.yml); also green without --all-features
• cargo fmt --all -- --check — clean
• cargo build -p efx --examples, cargo build -p efx-sandbox — build
• A throwaway example using Button (plain + styled), Hyperlink (both modes), TextField, Window open= passed clippy -D warnings

Reviewer notes

• Targets v0.7 (not main) per CONTRIBUTING.md; against main this would drag in all unreleased 0.7 commits.
• <Hyperlink> returns Response only in "advanced" mode; in simple mode it evaluates to (). Pre-existing, left as is, noted in AGENTS.md.
• wasm32 build of eframe_demo not run locally — CI covers it.

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