* [Client] Speak the 2026-07-28 lifecycle
On that revision the client opens with server/discover instead of
initialize, stamps each request's _meta with the protocol version, its own
capabilities and client info, and sends the standard Mcp-Method / Mcp-Name /
Mcp-Param-* headers an intermediary routes on. ToolCatalog is what knows,
from the tool list, which arguments a call has to mirror.
An input_required result is answered rather than surfaced: InputRequestResolver
asks the host's elicitation, sampling and roots handlers and retries the same
request carrying inputResponses and the requestState the server sent.
McpHeader holds the header names and the =?base64?…?= sentinel, so the two
sides no longer keep their own copies of the same rules.
* Fix CI baseline drift and address Copilot review findings
Drop stale expected-failure entries the new client fixture now passes.
Copilot review: fix McpHeader round-trip for a wrapper-shaped literal,
encode empty/numeric-keyed inputResponses as a JSON object, stop the
incident example repeating side effects on MRTR retry, and reset
ToolCatalog on reconnect instead of carrying the previous server's
verdicts.
* Skip DualEraExampleTestCase on PHP 8.1
PHP_CLI_SERVER_WORKERS does not reliably fork multiple php -S
workers there (php/php-src#9400), reproducing the single-worker
deadlock the extra workers exist to avoid.
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