v0.1: settle the public surface before the first tag #9757

Breaking changes are free before v0.1 and need compat code after it. The tag waits on these.

Main green:

• ci: scheduled run is failing #9216 scheduled ci.yml is green
• main: PR analysis fails with @@+elixir+dx_elixir//:elixir is not a declared dependency #9750 PR analysis check (elixir)
• main: typescript isolation_test, japicmp and cloudflare/oci verify tests fail locally #9751 typescript, japicmp and cloudflare/oci tests
• starlark docs and wrapper signature tests fail on main #9752 starlark docs and wrapper signature tests
• release: qualify consumer 'dx check //...' fails on both Linux cells, generate rewrites BUILD.bazel #6944 the release check passes the consumer dx check //...

Public API:

• binary/test macros: main, entry_point, srcs optionality and argument order differ per language #9522 binary/test macros: main, srcs and argument order (js/ts: rename entry_point to main on binary/test macros (#9522 slice 2) #9712, script-language binary/test: keyword-only (name, *, srcs, main) signature; php def macros (#9522 slice 3) #9713, srcs optional for d/elixir/ruby/powershell/csharp/fsharp; docstrings list applied defaults (#9522 slice 4) #9714)
• platforms/arch: one concept, many spellings and value sets, plus swift forwarder host-selected platform #9535 one platforms concept (msix, apple macos/ios, appimage: single platform label, drop arch (part of #9535) #9596, android rust_android_apk and cuda: platforms as labels, GPU archs under cuda_archs (part of #9535) #9597, swift forwarders: platforms attr, private extra toolchains, no host select (part of #9535) #9598, msix, apple macos, appimage, android, cuda, swift: platform labels (part of #9535) #9709)
• --output=json events: severity, level and status use different vocabularies; near-duplicate events #9557 --output=json schema 4.0 (output: one severity vocabulary across JSON events, schema 4.0 (part of #9557) #9652, output: shared finished def in events schema (closes #9557) #9711)
• deploy/rules public surface scattered: unrelated rules, exported validators, public config rules, cross-package deps #9543 deploy public surface (deploy: private validators and config rules, defs.bzl re-exports every macro (closes #9543) #9657)
• extensions: tag and extension names do not follow one scheme #9548 extension and tag names
• quality: config redesign tracking (dx.toml profiles, generated .dx, standard and strict tiers) #8472 quality config (dx.toml profiles)
• powershell, msix: move to families/powershell and families/msix #6511–rust: moves to families/rust #6516 family module names; powershell, msix: move to families/powershell and families/msix #6511 needs an owner decision on PowerShell in core

Release (owner):

• ci: push v0.1.0 on a starter consumer and confirm reusable-release.yml publishes a draft release after the dry run #7848, release: fill pins.bzl for the first real release and confirm a consumer downloads the prebuilt dx #5130, release: submit to BCR from release.yml and record bcr-submit as executed #6837, ci: apply the checked-in main ruleset so the gate check is required before merge #2607

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