feat(claude): add forward_host_credentials support
Reads the host's Claude OAuth session key from ~/.claude.json at launch and forwards it only to the egress sidecar (never to the agent), placing a placeholder CLAUDE_CODE_OAUTH_TOKEN in the agent env so Claude Code starts without seeing the real credential. Mirrors the existing Codex forward_host_credentials flow (PRD 0029). Adds claude_auth.py to extract and validate the sessionKey, a CLAUDE_HOST_CREDENTIAL_TOKEN_REF constant in egress.py, and updates manifest_agent.py to allow the flag for both 'codex' and 'claude' templates. Also adds a mutual-exclusion check that rejects setting both auth_token and forward_host_credentials together. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> fix(claude): read credentials from ~/.claude/.credentials.json The actual OAuth token is in ~/.claude/.credentials.json under claudeAiOauth.accessToken, not in ~/.claude.json. ~/.claude.json holds only UI state and profile metadata (oauthAccount has no token fields). expiresAt in the credentials file is milliseconds, not seconds. Discovered after testing against Claude Code 2.1.198. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> fix(claude): fall back to macOS Keychain for credentials On macOS, Claude Code stores credentials in the Keychain under service "Claude Code-credentials" rather than in a file. When ~/.claude/.credentials.json is absent, shell out to: security find-generic-password -s "Claude Code-credentials" -w and parse the result as the same JSON schema. ~/.claude.json holds only profile/UI metadata (oauthAccount has no token fields). expiresAt in the credentials is milliseconds. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> docs(prd): fix credential path references (~/.claude/.credentials.json) fix(test): suppress gitleaks false positives on synthetic Claude tokens
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@@ -45,6 +45,10 @@ PROVIDER_TEMPLATES = frozenset({PROVIDER_CLAUDE, PROVIDER_CODEX, PROVIDER_PI})
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# forward_host_credentials is enabled. Pipelock must pass these through
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# (no TLS MITM) or its header DLP blocks the injected JWT.
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CODEX_HOST_CREDENTIAL_HOSTS = ("api.openai.com", "chatgpt.com")
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# Host that egress injects the host Claude bearer on when Claude
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# forward_host_credentials is enabled.
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CLAUDE_HOST_CREDENTIAL_HOSTS = ("api.anthropic.com",)
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PromptMode = Literal[
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"append_file",
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"read_prompt_file",
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