CC secrets build: consumers switched to sec, S19 age key in the recovery runbooks, evidence (R-1118, R-1122)

Build skill (hub token, ISO publish), fb_probe (token from `sec run` env, tests red-proved), secrets.md (Resend:
pipe inside sec run), bench README, read_credential docstring, 12-agent-tooling §5, workspace CLAUDE secrets line.
Evidence: audits/cc-creds-build-2026-10-17/ (tests, red-proofs, 36-row child-session proof both launch modes,
install, fresh-session proof, import names+lengths, history sweep names).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012qRErfCoiTkvDK9N5XHbzb

scripts/facebook/fb_probe.py

@@ -14,7 +14,8 @@ Usage:  python3 scripts/facebook/fb_probe.py [-v] [--version v26.0] [--evidence
 There is deliberately NO "post for real" sub-command: real posting belongs to the skill written
 from this spike's findings (audits/SPIKE-facebook-page-api-2026-10-08.md).
 
-SECRETS. The token comes ONLY from ~/.config/credentials (key FACEBOOK_API); no flag takes one.
+SECRETS. The token comes from the CC secret store — run `sec run FACEBOOK_API -- python3 fb_probe.py …` — or,
+until the old file retires, from ~/.config/credentials (key FACEBOOK_API); no flag takes one.
 It travels as `Authorization: Bearer`, never in a logged URL (the one query-string carrier,
 debug_token's input_token, is never printed: -v prints the path without its query). Every saved
 response passes redact(): every `access_token` key is dropped and any string carrying a held token
@@ -78,6 +79,17 @@ def vlog(msg):
 
 # ---------------------------------------------------------------- the key (R-453)
 
+def check_value(value):
+    """Assert the shape of a Meta token: no quote, no whitespace, starts with EAA."""
+    if any(q in value for q in ("'", '"')):
+        raise CredentialError("value still contains a quote character")
+    if any(c.isspace() for c in value):
+        raise CredentialError("value contains whitespace")
+    if not value.startswith("EAA"):
+        raise CredentialError("value does not start with EAA (starts %r)" % value[:3])
+    return value
+
+
 def load_key(path, key=KEY):
     """Return the value of `key`. Accepts an optional `export ` prefix; ONE matching quote pair is
     stripped by read_credential.unwrap. Then asserts: no quote, no whitespace, starts with EAA."""
@@ -87,17 +99,18 @@ def load_key(path, key=KEY):
             if s.startswith("export "):
                 s = s[len("export "):].lstrip()
             if s.startswith(key + "="):
-                value = unwrap(s[len(key) + 1:].strip())
-                if any(q in value for q in ("'", '"')):
-                    raise CredentialError("value still contains a quote character")
-                if any(c.isspace() for c in value):
-                    raise CredentialError("value contains whitespace")
-                if not value.startswith("EAA"):
-                    raise CredentialError("value does not start with EAA (starts %r)" % value[:3])
-                return value
+                return check_value(unwrap(s[len(key) + 1:].strip()))
     raise CredentialError("key %r not present in %s" % (key, path))
 
 
+def token_from(env, path, key=KEY):
+    """The token: from the environment when `sec run FACEBOOK_API -- python3 fb_probe.py …` put it there (the
+    CC secret store, cc-secrets ARCHITECTURE.md); otherwise from the old credentials file, until that file retires."""
+    if key in env:
+        return check_value(env[key]), "environment (sec run)"
+    return load_key(path, key), path
+
+
 # ---------------------------------------------------------------- redaction
 
 def redact(obj, secrets=None):
@@ -569,12 +582,12 @@ def main(argv=None):
     a = build_parser().parse_args(argv)
     VERBOSE = a.v
     try:
-        token = load_key(a.credentials)
+        token, source = token_from(os.environ, a.credentials)
     except (CredentialError, OSError) as e:
         log("KEY REFUSED [%s]: %s" % (KEY, e))
         return 2
     SECRETS.append(token)
-    log("key %s: %d chars, starts %s" % (KEY, len(token), token[:3]))
+    log("key %s: %d chars, starts %s, from %s" % (KEY, len(token), token[:3], source))
     # write-test re-derives A and B into its own sub-directory, so the read run's files stay as they were
     sub = {"read": "", "write-test": "write-test"}.get(a.cmd, "first-post")
     g = Graph(a.version, a.evidence if not sub else os.path.join(a.evidence, sub))