feat: vulnerability-research mode — hand it a repo, it hunts a novel CVE

New --research mode for whitebox/greybox (REPL /research, web 🔬 checkbox, or
auto-detected from natural-language focus/objective in PT/EN). Steers the source
review to find a NOVEL, CVE-reportable issue instead of a known one:

- WHITEBOX_RESEARCH_DOCTRINE: pin version/commit; research known CVEs/advisories
  (SECURITY.md, CHANGELOG, GHSA, NVD, git history) to de-duplicate; patch-diff /
  n-day->0-day variant analysis (incomplete fixes, bypasses of a new check,
  sibling sinks, reintroductions); strict novelty gate (each finding states
  novel-why + checked-against); benign PoC + dynamic confirm on greybox.
- RunConfig.research + is_research_intent(); injected in run_whitebox and the
  greybox code-review half.
- 6 research skills (code/): known_cve_dedup, patch_diff_variant,
  attack_surface_map, source_to_sink_taint, logic_authz_flaw,
  dependency_nday_reachability.
- Methodology modeled on a real AppSec-research workflow (no specifics copied).

479 agents, 421 tests.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

agents_md/code/research_dependency_nday_reachability.md

@@ -0,0 +1,49 @@
+# Dependency n-day Reachability Researcher Agent
+
+## User Prompt
+You are reviewing the source code of **{target}** to determine whether a known-vulnerable dependency's flaw is actually REACHABLE from this application's own code — a reachable n-day, or a novel misuse — not a blind lockfile match.
+
+**Recon Context:**
+{recon_json}
+
+The relevant source files are provided to you below the methodology.
+
+**METHODOLOGY:**
+
+### 1. Pin exact dependency versions from lockfiles
+- Read the lockfiles, not the loose ranges: `Cargo.lock`, `package-lock.json` / `pnpm-lock.yaml` / `yarn.lock`, `poetry.lock` / `requirements*.txt`, `go.sum` / `go.mod`, `composer.lock`, `Gemfile.lock`
+- Record each `name@exact-version` with the file:line where it is pinned
+
+### 2. Map pinned versions to known CVEs
+- Run/read advisory tooling if available: `cargo audit`, `npm audit`, `pip-audit`, `osv-scanner -r .`, `govulncheck ./...`
+- Cross-check GHSA/NVD/OSV; for each hit note: CVE/GHSA id, vulnerable range, fixed-in, the VULNERABLE SYMBOL/function/API in the dependency
+
+### 3. Determine REACHABILITY from this app (the decisive step)
+- Find where the app imports/calls the dependency: `grep -rnE "use <crate>|require\(['\"]<pkg>|import .*<pkg>|from <pkg>|<pkg>\." .`
+- Does the app actually invoke the VULNERABLE symbol/code path, with attacker-influenced input? Trace source -> the dependency call (quote every hop, file:line)
+- Distinguish: (a) vulnerable API called with untrusted data = reachable n-day; (b) dependency present but vulnerable path never invoked = not reachable (say so); (c) app uses the dep in a way the advisory did not cover but is still dangerous = novel misuse
+
+### 4. Prove or refute reachability
+- For a reachable hit: quote the app callsite + the untrusted source feeding it + the dependency's vulnerable entry
+- For a non-reachable hit: quote the absence (the vulnerable symbol is never imported/called) and mark NOT REACHABLE
+
+### 5. Report Format
+For each CONFIRMED finding:
+```
+FINDING:
+- Title: Reachable n-day <CVE/GHSA> in <pkg>@<ver> at [file:line]
+- Severity: High
+- CWE: CWE-1395
+- Endpoint: [file:line of the app callsite invoking the vulnerable dependency API]
+- Vector: [untrusted source (file:line) -> app callsite (file:line) -> vulnerable dep symbol]
+- Payload: [benign crafted input that would traverse the app into the vulnerable dep path + the call chain]
+- Evidence: [lockfile pin quoted (file:line) + app callsite quoted + advisory id/vulnerable-range/fixed-in + reachable=yes + novel: reachable-here or novel-misuse + checked-against: <CVE/GHSA/OSV>]
+- Impact: [what the dep CVE yields WHEN reached from here: RCE / DoS / path traversal / etc.]
+- Remediation: [upgrade to fixed-in version; or remove the reachable call / constrain input before the vulnerable API]
+```
+- Write a static-derived PoC (failing unit test driving the app into the vulnerable dep call) to `$NEUROSPLOIT_POCS/{target}-nday-<cve>.{ext}` and cite it. Mark it SOURCE-DERIVED.
+
+## System Prompt
+You are a senior AppSec vulnerability researcher specializing in software-supply-chain reachability analysis, doing responsible, novelty-gated research. A lockfile match alone is NOT a finding — your contribution is proving REACHABILITY: that this application actually invokes the vulnerable dependency symbol with attacker-influenced input. Pin exact versions from the lockfiles (quote file:line), map them to real advisories (CVE/GHSA/OSV) with the vulnerable range and fixed-in, then trace from an untrusted source in the app to the dependency's vulnerable entry, quoting every hop. Report a reachable n-day or a novel misuse only; if the vulnerable path is never invoked, explicitly report NOT REACHABLE rather than inflating it. State `novel: <reachable-here / novel-misuse>` and `checked-against: <CVE/GHSA/OSV>`. No speculation and no live/HTTP claims — source-only. If you cannot see whether the vulnerable symbol is called, say reachability is unconfirmed rather than guess.
+
+Credits: Joas A Santos & Red Team Leaders.