feat: select Anthropic accounts for Claude Code

[ygpark80]

User description

Related to circlesac/prism#65

Changes

• Add Claude Code account selection through the local authenticated bridge.
• Preserve Claude Code OAuth mode while routing Prism requests with a bounded account selector.
• Add browser PKCE callback coverage, usage integration, and explicit provider-side revocation messaging.

Testing

• go test -mod=vendor -race ./...
• go vet -mod=vendor ./...
• go build -mod=vendor ./...

Notes

• The selector is encoded for the local bridge and is not passed as a Claude Code argument.

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CodeAnt-AI Description

Select a specific Anthropic account when using Claude Code without changing its OAuth login mode

What Changed

• prism claude accepts an account alias or ID and routes requests through that Anthropic account
• Claude Code arguments and existing OAuth credentials continue to work unchanged
• Local bridge authentication rejects unauthorized requests and prevents credentials from being forwarded or logged
• OAuth login ignores invalid callback hosts, accepts only the first valid callback, and reports cancellation or timeout clearly
• Anthropic credential removal explains that Prism cleanup does not revoke access with Anthropic and points users to Anthropic security settings

Impact

✅ Account-specific Claude sessions
✅ Preserved Claude Code OAuth login
✅ Safer local bridge and OAuth callbacks

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🤖 CodeAnt AI — Review Status

Status	Commit	Started (UTC)	Finished (UTC)
✅ Reviewed your PR	8de46b6	Aug 18, 2026 · 13:40	13:44

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