refactor!: remove generated ProviderName and stale generated artifacts (ROADMAP A2–A5)

[cunninghamcard-bit]

Summary

ROADMAP A2–A5 mechanical cleanup, now based on master and independent of #200: cleanup of generated and superseded artifacts (~171k lines deleted, ~3.6k of them real code/doc changes), plus removal of the generated ProviderName type. Supersedes #202 (same commits, rebased).

Removed

• docs/quality-audit/round4 generated artifacts (lcov/logs); .gitignore now keeps raw output out, conclusions stay in Markdown.
• provider-inventory/providers.json + raw records (superseded; doc links now point at the fixed historical commit 892a351).
• Flutter example linux/macos/windows runners (unused).
• Breaking: generated ProviderName in every binding (Rust enum, TS const, Go/Java/Kotlin consts, Swift enum, Dart consts, Python Literal) and scripts/gen_provider_names.py. Provider names are plain strings: provider("groq", ...). Built-in and overlay-registered names share one string path. Rust keeps provider_names() (the web console's GET /api/providers needs a runtime list). Recorded in CHANGELOG [Unreleased].
• Stale provider_name references left behind in scripts/gen_providers_doc.py and docs/internal/phase4-audit.md.

Changed (aimux-web frontend types)

• The 139 ts-rs copies under web/src/types/ are gone; core types resolve through an @aimux/types/* tsconfig alias (type-only, erased at build).
• Wire*.ts were hand-maintained mirrors of wire.rs and had already drifted (WireContentPart lacked provider_executed). They are now generated by ts-rs into web/src/types/generated/.
• scripts/gen_ts_types.py handles two targets (aimux-core → bindings/node/src/types, aimux-web → web/src/types/generated); --check covers both. The wire export tests sit behind a ts-export feature so a plain cargo test never writes into the node bindings. sync no longer rewrites files that differ only by ts-rs end-of-line spaces.

Node string-literal union (review question)

Intentional. ROADMAP's A2 line said Node would keep a generated string-literal union for completion; that sentence was wrong and the last commit corrects it. Overlay-registered provider names can never be part of a compile-time union, so a union would only ever describe the built-in subset and would keep the second name path this PR removes. Node takes plain string like every other binding.

Review notes

• Most of the diff is deletions; real logic is in aimux-providers/src/{lib,provider}.rs, scripts/gen_ts_types.py, tools/aimux-web/src/wire.rs, tools/aimux-web/web/{tsconfig.json,src/**} and bindings/node/{package.json,src/index.ts}.
• Independent Codex review found two issues (redundant #[must_use] tripping clippy::double_must_use; plain cargo test exporting wire types into the node bindings); both fixed.

Test plan

• Rebased onto master (72a37b5) without conflicts; CI now runs on this PR.
• cargo clippy -p aimux-providers -p aimux-web --all-targets -- -D warnings
• cargo test -p aimux-providers
• python3 scripts/gen_ts_types.py --check, python3 scripts/gen_providers_doc.py --check
• CI on the current head (24 jobs) — see checks below

🤖 Generated with Claude Code

https://claude.ai/code/session_01WGwanvo9WLU9HWD7sRR8TS

[eric8810]

这批清理与现有 ROADMAP 的 A2–A5 有重合，可以先明确哪些内容能独立于 #200 推进。

• 当前 head 3521d5d 没有 CI checks；描述里的 24/24 是重排前的 2d0165c。工作流只覆盖 base 为 master 的 PR，当前堆叠 base 不会触发。后续调整 base / 重排后，需要补当前候选提交的验证结果。
• ROADMAP 原先要求 Node 保留生成的 string-literal union 补全；这里连同 ProviderName 类型导出一起移除了。请明确这是有意变更要求，还是另行补上。
• 在 docs: full-chain AI SDK alignment design and impact map #200 与已合入 ROADMAP 的关系及已有决策记录澄清前，建议保持 draft；若这批只做既定清理，可以讨论解除文档 PR 的依赖，避免把清理合入等同于接受整套新架构。

[cunninghamcard-bit]

已按建议解耦：base 改为 master，9 个提交在 72a37b5 上重放无冲突，CI 现在会跑；描述里的验证结果以当前 head 为准。

Node string-literal union：是有意去掉。ROADMAP 那句是写错的——overlay 注册的 provider 名字进不了编译期联合类型，保留 union 只能覆盖内置子集，等于保留了本 PR 要删掉的第二条路径。末尾加了一个提交把 ROADMAP A2 那行改成实际范围。

这批只做既定的 A2–A5 清理，不依赖 #200；合入不代表接受那套架构。

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