v0.3.1: --dump-offsets tool + NOTICE.md per module

The README has been claiming "each module credits the original CVE
reporter and PoC author in its NOTICE.md" since v0.1.0, but only
copy_fail_family actually shipped one. Fixed.

  modules/<name>/NOTICE.md (×19 new + 1 existing): per-module
    research credit covering CVE ID, discoverer, original advisory
    URL where public, upstream fix commit, IAMROOT's role.

  iamroot.c: new --dump-offsets subcommand. Resolves kernel offsets
    via the existing core/offsets.c four-source chain (env →
    /proc/kallsyms → /boot/System.map → embedded table), then emits
    a ready-to-paste C struct entry for kernel_table[]. Run once
    as root on a target kernel build; upstream via PR. Eliminates
    fabricating offsets — every shipped entry traces back to a
    `iamroot --dump-offsets` invocation on a real kernel.

  docs/OFFSETS.md: documents the --dump-offsets workflow.
  CVES.md: notes the NOTICE.md convention + offset dump tool.

  iamroot.c: bump IAMROOT_VERSION 0.3.0 → 0.3.1.

modules/nft_set_uaf_cve_2023_32233/NOTICE.md

@@ -0,0 +1,33 @@
+# NOTICE — nft_set_uaf (CVE-2023-32233)
+
+## Vulnerability
+
+**CVE-2023-32233** — nf_tables anonymous-set deactivation skip →
+slab UAF on the freed `nft_set` object exploitable via msg_msg
+cross-cache groom in kmalloc-cg-512.
+
+## Research credit
+
+Discovered and disclosed by **Patryk Sondej** and **Piotr Krysiuk**,
+May 2023.
+
+Original advisory + writeup distributed via the OSS-Security list
+and an accompanying Google Drive PoC.
+Follow-up exploit and Crusaders-of-Rust analysis built on the
+public trigger.
+
+Upstream fix: mainline 6.4-rc4 (commit `c1592a89942e9`, May 2023).
+Branch backports: 6.3.2 / 6.2.15 / 6.1.28 / 5.15.111 / 5.10.180 /
+5.4.243 / 4.19.283.
+
+## IAMROOT role
+
+Hand-rolled nfnetlink batch: NEWTABLE → NEWCHAIN (base, LOCAL_OUT
+hook) → NEWSET (ANON|EVAL|CONSTANT) → NEWRULE (nft_lookup
+referencing the set by `NFTA_LOOKUP_SET_ID`) → DELSET → DELRULE
+in the same transaction. msg_msg cg-512 spray with `IAMROOT_SET`
+tags.
+
+`--full-chain` forges a freed-set with `set->data = kaddr` at the
+Sondej/Krysiuk reference offset (0x30) and drives a NEWSETELEM with
+the modprobe_path payload bytes via the shared finisher.