refactor(provider): rename subscription-provider symbols, files and directories

[code-yeongyu]

Behaviour-free internal rename completing the senpi side of #1989 (todo 10). 280 files, 130 git mv moves, one atomic commit.

What renamed

Symbols (CLAUDE_SDK_OAUTH_* -> ANTHROPIC_SUBSCRIPTION_*, ClaudeSdkOauth* -> AnthropicSubscription*, OpenAICodex*/openaiCodex* -> ChatGptSubscription*/chatgptSubscription*, incl. the SCREAMING constants), the builtin extension directory claude-sdk-oauth/ -> anthropic-subscription/ (56 files), the provider/oauth/util modules, the catalog shard, the matching test + senpi-qa script names, and the bundle script's oauth module map.

What did NOT rename, and why

Kept	Reason
OPENAI_CODEX_RESPONSES_API, OpenAICodexResponsesOptions, CLAUDE_SDK_OAUTH_API_ID, api/openai-codex-responses/, legacy-api-aliases.ts family	the symbol names the frozen wire api, not the provider
claudeSdkOauthProvider (the settings property)	settings.ts reads anthropicSubscriptionProvider ?? claudeSdkOauthProvider — that name IS the two-release compatibility window. Renaming it logs out every user whose settings predate the migration. Only the wrapping type SettingsWithClaudeSdkOauthProvider moved.

Frozen VALUES are byte-identical

All 8 present verbatim in packages/*/src: openai-codex-responses ×100, claude-sdk-oauth-managed ×10, claude-sdk-oauth-compact ×4, senpi.claude-sdk-oauth.compact-boundary.v1 ×4, .claude-sdk-oauth-binding.json ×3, CLAUDE_CODE_OAUTH_TOKEN ×25, claude_sdk_oauth_ ×20, claude-sdk-oauth-tool-watch ×3. LEGACY_PROVIDER_IDS keys intact. Symbols holding a frozen value were renamed; their string contents were not.

Numeric before/after (the acceptance criterion)

Suite	BEFORE	AFTER
packages/ai	311 passed / 27 skipped (338); 2965 passed / 886 skipped	identical
packages/coding-agent	4 failed / 1524 passed (1535); 6 failed / 12338 passed	1524 passed; 12338 passed — same pass count

The coding-agent baseline is not clean: 4 known local-env failures (agent-session-compaction 4010>4000, terminal-bash-session-env $HOME/$TMPDIR, process-teardown race, mcp/reconnect timing) that pass on CI. Comparing names, not counts, caught two real regressions this pass:

1. settings-provider-key-migration-offdisk.test.ts — the sweep rewrote the string "openaiCodexProvider", but there it is a legacy settings KEY, not a symbol; the assertion then contradicted the line above it. Restored.
2. gpt-6-astra-context-window.test.ts — the shard filename was replaced in place, leaving the sorted list out of order. chatgpt-subscription.json re-sorted after bai.json.

A count-only check would have read "4 failed before, 4 failed after" and shipped both.

Gates (scoped)

• Root bunx tsc --noEmit -p tsconfig.json — exit 0. That config's include is packages/*/src/**/* and packages/*/test/**/*, so it covers both packages and the ~83 renamed test files.
• bunx biome check --error-on-warnings — 0 errors (6 pre-existing infos in untouched files)
• bun run check:model-data — PASS; manifest regenerated, 42/42 sha256 entries match, 0 orphans
• Changelog gate (real script) — PASS, 12 production paths covered, both package CHANGELOGs; extension changes.md moved with its directory, no orphan at the old path

Part of #1989

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Summary by cubic

Behaviour-free internal rename that switches subscription-provider symbols, files, and directories to the canonical names from #1989. ClaudeSdkOauth*/CLAUDE_SDK_OAUTH_* becomes AnthropicSubscription*/ANTHROPIC_SUBSCRIPTION_* and OpenAICodex*/openaiCodex* becomes ChatGptSubscription*/chatgptSubscription* across 280 files — the builtin extension directory, provider/oauth/util modules, the model-data catalog shard, tests, and senpi-qa scripts. Test pass counts are identical before and after.

Refactors

• Renames the builtin extension directory claude-sdk-oauth/ -> anthropic-subscription/, the provider and OAuth modules, the catalog shard, and the matching test and script names in both packages.
• Symbols that name the frozen wire api stay: OPENAI_CODEX_RESPONSES_API, OpenAICodexResponsesOptions, CLAUDE_SDK_OAUTH_API_ID, and api/openai-codex-responses/.
• Comparing names instead of pass counts caught two sweep regressions, both restored: a legacy settings key string rewritten in settings-provider-key-migration-offdisk.test.ts and an out-of-order catalog list in gpt-6-astra-context-window.test.ts.

Migration

• Persisted values are byte-identical: openai-codex-responses, claude-sdk-oauth-managed, claude-sdk-oauth-compact, CLAUDE_CODE_OAUTH_TOKEN, and LEGACY_PROVIDER_IDS — only the symbols holding them were renamed.
• The settings property claudeSdkOauthProvider keeps its name because settings.ts reads anthropicSubscriptionProvider ?? claudeSdkOauthProvider; renaming it closes the two-release compatibility window and logs out users whose settings predate the migration.

^{Written for commit 3c816ea. Summary will update on new commits.}