fix(docs): the my-bindings fixture reads buffers inside a no-GC scope

[steinybot]

Merge in this order:

1. fix(docs): the my-bindings fixture reads buffers inside a no-GC scope #12112 (this PR)
2. fix(ext): ext-crate tests root values through RuntimeHandleScope #12113
3. fix(runtime): audit the new raw stores and classify addresses with addr_class #12114
4. ci: register the dark GC witnesses and isolate the new test counters #12115
5. refactor: split five files back under the 2000-line cap #12116
6. fix(runtime): root raw handles across calls and correct the handle ratchets #12117
7. fix(runtime): instanceof never mints a class object for a builtin id #12118
8. fix(gc_effects): exempt aHash's random-source init from the indirect-call taint #12119
9. docs: regenerate the API reference #12120
10. fix(runtime): clear the gates that #12109 left red #12121
11. fix(runtime): match node on the gap-suite regressions #12149

Problem

CI on main is red again after #12025. Commits since then broke check, warnings, cargo-test, gc-call-effects, self-test-checkers, gap-suite and fourteen lint steps, so no PR can show a green build. Each later failure in a job was hidden behind an earlier one.

Solution

Fix each breakage in its own PR. Each PR targets main and holds every fix above it in the order list, so the last PR is the one that can run fully green. Merge in order: each diff then shrinks to its own fix.

In this PR

Fixes the compile error that stops check and warnings. read_buffer_bytes takes a NoGc scope since #12103, and the docs fixture still called it with one argument.

Changes

1. Read the buffer inside no_gc (diff). The fixture only needs the length, so it reads it inside the scope.

   perry/docs/examples/_fixtures/native-libraries/my-bindings/src/lib.rs

   Lines 21 to 23 in f93cdd9

   	let len =
   	perry_ffi::bytes::no_gc(|scope| read_buffer_bytes(buf_ptr, scope).map_or(0, <[u8]>::len));
   	let summary = format!("stub: {len} bytes");

2. Link the runtime for the fixture's tests (diff). Its tests call runtime-backed perry-ffi functions. They take perry-ffi with runtime-link as a dev-dependency, as the ext crates do.

   perry/docs/examples/_fixtures/native-libraries/my-bindings/Cargo.toml

   Lines 17 to 19 in f93cdd9

   	[dev-dependencies]
   	perry-ffi = { workspace = true, features = ["runtime-link"] }

🤖 Generated with Claude Code

https://claude.ai/code/session_01V5MSmMLJm6sMdSS5r64ds7

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