fix(api): restack unsupported exchange method short-circuit on current main

[seonghobae]

Fresh protected-main successor for #101 on exact base 1a8a77d67f61a2c61e88974be9206a91d19acdf4. No predecessor checks, reviews, scanner output, model judgment, or production evidence transfers.

Current test-first RED head 74ee8801620e5189ee3ac0c8ededd049c638365d adds only the executable /exchange method contract. Current protected src/entrypoint.ts enters OIDC envelope/body and GitHub egress-configuration handling before rejecting unsupported methods; the regression requires GET/HEAD/PUT/PATCH/DELETE/OPTIONS to return the public 405 contract before credential egress configuration and distributed limiter side effects, with HEAD bodyless.

Selected bounded GREEN after RED is proven: short-circuit unsupported methods at the outer /exchange entrypoint while preserving POST behavior, security/cache/trace headers, and every credential-bearing path.

Historical #101 remains open until this current-main successor proves and preserves the complete two-file contract.

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[seonghobae]

Superseded by fresh protected-main successor #214 after exact byte/scope comparison.

Fresh identities immediately before this closure decision:

• protected main: 0b515c11670f26f888ccdf66707f34b946f505ef;
• fix(api): restack unsupported exchange method short-circuit on current main #206 unchanged head: a9a66b795d80b6a6ab14202ba54d3dd68f2e241b;
• fix(api): short-circuit unsupported exchange methods on current main #214 current head: 0bbe699656aab93fa3d50b7fea50626f1d873639 on exact current main base.

Preservation proof:

• fix(api): restack unsupported exchange method short-circuit on current main #206 src/entrypoint.ts blob and fix(api): short-circuit unsupported exchange methods on current main #214 current src/entrypoint.ts blob are identical (cca10aba46b92cc21662fa18a63e5ae9035978c5);
• fix(api): restack unsupported exchange method short-circuit on current main #206 test/exchange-method-contract.test.ts and fix(api): short-circuit unsupported exchange methods on current main #214 current test blob are identical (a58377a74c186bf81499042be834b573487feb5c);
• fix(api): restack unsupported exchange method short-circuit on current main #206's only extra changed path, scripts/check-kpi.mjs, is already byte-identical to current protected main (10ba8c0a8a03f95aae5df88ab01bc05e10b17b4f) and is therefore base-drift, not unique fix(api): restack unsupported exchange method short-circuit on current main #206 work;
• fix(api): restack unsupported exchange method short-circuit on current main #206 has no current review threads or formal reviews to preserve;
• fix(api): short-circuit unsupported exchange methods on current main #214 current exact head has fresh terminal-success application ci 31577641753, reviewer-ci 31577641742, and eligible central Security Scan 31577641765. Those results belong only to fix(api): short-circuit unsupported exchange methods on current main #214 and do not transfer to fix(api): restack unsupported exchange method short-circuit on current main #206.

Closing #206 unmerged removes the stale parallel writer without discarding unique API behavior or tests. #214 remains the sole current-main owner; its branch is otherwise left untouched in this invocation because its head moved during the fresh writer-state sweep.