refactor: reorganize RTL files into core/noise subdirectories

- Move CAM core modules (cam_core_banked, match_engine_pipeline, popcount_pipeline) to hw/rtl/core/
- Move noise modules (cam_read_noise, cam_write_noise, noise_mask_grouped) to hw/rtl/noise/
- Update Makefile include paths and VERILOG_SOURCES to reflect new layout
- Update docs/experiments.md file path references
- Add sim/results.xml to .gitignore
- Bump devenv.lock dependencies

devenv.lock

@@ -3,11 +3,11 @@
     "devenv": {
       "locked": {
         "dir": "src/modules",
-        "lastModified": 1773767086,
-        "narHash": "sha256-3eKyl4LXswf6P17/u59x8oQXDgCfYX+UX0uh7YHFwJc=",
+        "lastModified": 1778705971,
+        "narHash": "sha256-n0LjnKBAjJ5/mgNzOCeVvAeHUrNMUZ3fBQx/UDCkHtQ=",
         "owner": "cachix",
         "repo": "devenv",
-        "rev": "a5e5a7f8b1c9a7f33f9d82192b692768b39ec710",
+        "rev": "64d4353a3628c4138c84d8ba10987da2ba27fddd",
         "type": "github"
       },
       "original": {
@@ -61,11 +61,11 @@
         "nixpkgs-src": "nixpkgs-src"
       },
       "locked": {
-        "lastModified": 1773704619,
-        "narHash": "sha256-LKtmit8Sr81z8+N2vpIaN/fyiQJ8f7XJ6tMSKyDVQ9s=",
+        "lastModified": 1778507786,
+        "narHash": "sha256-HzSQCKMsMr8r55LwM1JuzIOB+8bzk0FEv6sItKvsfoY=",
         "owner": "cachix",
         "repo": "devenv-nixpkgs",
-        "rev": "906534d75b0e2fe74a719559dfb1ad3563485f43",
+        "rev": "8f24a228a782e24576b155d1e39f0d914b380691",
         "type": "github"
       },
       "original": {
@@ -78,11 +78,11 @@
     "nixpkgs-src": {
       "flake": false,
       "locked": {
-        "lastModified": 1773597492,
-        "narHash": "sha256-hQ284SkIeNaeyud+LS0WVLX+WL2rxcVZLFEaK0e03zg=",
+        "lastModified": 1778274207,
+        "narHash": "sha256-I4puXmX1iovcCHZlRmztO3vW0mAbbRvq4F8wgIMQ1MM=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "a07d4ce6bee67d7c838a8a5796e75dff9caa21ef",
+        "rev": "b3da656039dc7a6240f27b2ef8cc6a3ef3bccae7",
         "type": "github"
       },
       "original": {