Fix error related to case sensitivity for email routing

[Muhammad-Bin-Ali]

Resolves #988

Fix email routing for mail-server-lowercased agent names

Closes the case-sensitivity gap in routeAgentEmail where email infrastructure lowercases addresses before delivery, causing PascalCase agent bindings to fail lookup.

Problem

Email servers normalize addresses to lowercase. When a user sends to SomeAgent+123@domain.com, the Worker receives someagent+123@domain.com. The router's lookup map only contained:

• SomeAgent (original binding name)
• some-agent (kebab-case, added in v0.0.106)
  The plain-lowercase someagent had no match, producing:

Agent namespace 'someagent' not found in environment. Available agents: SomeAgent

Fix

Register a third key — key.toLowerCase() — in the agent map alongside the existing original and kebab-case entries. The map now contains:

• SomeAgent → namespace
• some-agent → namespace
• someagent → namespace
  Also refactored the cache to store original binding names separately, so the error message lists only original names without lowercase/kebab duplicates.

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Latest commit: eabdf7a

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
agents	Patch

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