bug: remove hardcoded API token and session secret from app.js

[devin-ai-integration]

Summary

app.js declared an API token as a string literal and printed it to stdout on every start, and configured express-session with the literal 'keyboard cat'. Both are hardcoded credentials (CWE-798); the logged token also leaks into any log aggregation.

• Deleted the token entirely — it was dead code (no other reference in the repo), so there is nothing to re-plumb:

  -var token = 'SECRET_TOKEN_[REDACTED]';
  -console.log('token: ' + token);

• Session config now comes from the environment via two new helpers in utils.js:

  session({ secret: utils.session_secret(), name: 'connect.sid', cookie: utils.session_cookie() })

  session_secret(env = process.env) returns SESSION_SECRET when it is >= 32 chars; in production it throws (fail closed) rather than falling back, otherwise it warns and uses an ephemeral crypto.randomBytes(32) value. session_cookie(env) keeps path: '/' and adds httpOnly: true, sameSite: 'lax', and secure (on in production, overridable with SESSION_COOKIE_SECURE).
• tests/session-config.test.js (tap) asserts app.js contains no token/secret literal and no console.log of a token, plus the helper behaviors. 6/6 pass locally.
• README documents the new env vars and notes the leaked token value must be rotated wherever it was issued.

Devin-Org: engineering

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