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

bot_bottle/egress.py

@@ -30,6 +30,7 @@ if TYPE_CHECKING:
     from .manifest import ManifestBottle
 
 CODEX_HOST_CREDENTIAL_TOKEN_REF = "BOT_BOTTLE_CODEX_HOST_ACCESS_TOKEN"
+CLAUDE_HOST_CREDENTIAL_TOKEN_REF = "BOT_BOTTLE_CLAUDE_HOST_ACCESS_TOKEN"
 
 EGRESS_HOSTNAME = "egress"
 
@@ -400,6 +401,7 @@ class Egress(ABC):
         )
 
 __all__ = [
+    "CLAUDE_HOST_CREDENTIAL_TOKEN_REF",
     "CODEX_HOST_CREDENTIAL_TOKEN_REF",
     "EGRESS_HOSTNAME",
     "EGRESS_ROUTES_FILENAME",