fix(cli): diagnose missing extension archives before linking

[proggeramlug]

Fixes #11002.

The compile pipeline already runs nm on emitted object files and the core archives before invoking the linker. It now records undefined symbols owned by a well-known extension, checks definitions in the selected archives, and reports any missing extension archive with its Cargo package and search-path hint. Network wrappers get a joint build command so they share Tokio with the stdlib archive.

The check runs before stub generation or the final link. It reports one deterministic message per missing archive, and skips symbols already defined by a linked archive.

Validation:

• cargo check --profile perry-dev -p perry
• Focused test: missing_ext_archive_names_emitted_symbols_and_their_providers
• cargo build --profile perry-dev -p perry
• Source-less PERRY_NO_AUTO_OPTIMIZE=1 compile of a node:net import with core archives only: previously reached ld with undefined _js_ext_net_nm_install; now exits before linking and names libperry_ext_net.a, the joint build command, and PERRY_RUNTIME_DIR / PERRY_LIB_DIR.
• cargo fmt --all --check, scripts/check_file_size.sh, git diff --check, and raw-handle debt ratchet (906 → 906)

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between c7cbc3c and b3c5bae.

📒 Files selected for processing (5)

• changelog.d/11007-missing-ext-archive-diagnostic.md
• crates/perry-codegen/src/ext_registry.rs
• crates/perry/src/commands/compile/optimized_libs.rs
• crates/perry/src/commands/compile/optimized_libs/tests.rs
• crates/perry/src/commands/compile/run_pipeline.rs

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[proggeramlug]

Landed on main in merge train 257 (#11039, v0.5.1640), main 990b3eeada.

Carried at head b3c5bae716. CI on the train head passed every job except the known public-baseline lint step: all 6 gap shards, cargo-test, e2e-scoped, gc-stress, check, warnings and security-audit green.

This train was split by blast radius after an earlier 35-PR assembly hit five gap regressions: it carries only PRs touching no lowering path. Trains rebase-merge, so commits get new SHAs and GitHub cannot mark this merged. Closed as landed.