New test

docs/discovery-notes.md

@@ -2157,3 +2157,99 @@ Next confirmations:
 - If a response differs between a plain/direct command and a primer-pair query,
   treat the first host frame as a mode/context selector rather than only a
   generic wake-up primer.
+
+## Context Selector Confirmation Tests
+
+Goal: confirm whether the first host frame is only a generic primer, or whether
+it selects a response page/context for the next command.
+
+The test method is to hold the second/query command constant and change only
+the first frame:
+
+```text
+selector/primer -> selected query
+```
+
+Strong confirmation:
+
+- Same selected query, different first frame, different RCP response.
+- Example pattern: `00 -> B8` returns one block while `B7 -> B8` returns a
+  different block.
+
+Weak or negative result:
+
+- Same selected query always returns the same block regardless of the first
+  frame.
+- The differing blocks from the paused direct sweep were caused by longer
+  sequence/timing effects rather than a two-frame selector.
+
+### Test CS1: Known Generic `00` Page
+
+This rechecks the current generic-primer page for the commands that had
+different-looking responses in the paused direct sweep.
+
+```powershell
+python scripts/serial_primer_candidate_sweep.py --port COM5 --primer-command 0x00 --candidates "0xA0 0xB8 0xBC" --prompt-power-cycle --log captures/rcp-context-selector-00-a0-b8-bc.txt
+```
+
+Expected from prior primer sweeps:
+
+| Pair | Expected response |
+| --- | --- |
+| `00 -> A0` | `07 80 68 40 30 C5` |
+| `00 -> B8` | `07 80 EE 40 30 43` |
+| `00 -> BC` | `07 80 EF 40 30 42` |
+
+### Test CS2: Suspected Alternate Selectors
+
+These test the pairings implied by the paused direct sweep. Power-cycle before
+each prompt.
+
+```powershell
+python scripts/serial_primer_candidate_sweep.py --port COM5 --primer-command 0x9F --candidates 0xA0 --prompt-power-cycle --log captures/rcp-context-selector-9f-a0.txt
+python scripts/serial_primer_candidate_sweep.py --port COM5 --primer-command 0xB7 --candidates 0xB8 --prompt-power-cycle --log captures/rcp-context-selector-b7-b8.txt
+python scripts/serial_primer_candidate_sweep.py --port COM5 --primer-command 0xBB --candidates 0xBC --prompt-power-cycle --log captures/rcp-context-selector-bb-bc.txt
+python scripts/serial_primer_candidate_sweep.py --port COM5 --primer-command 0xAF --candidates 0xB0 --prompt-power-cycle --log captures/rcp-context-selector-af-b0.txt
+```
+
+Compare against these paused/direct observations:
+
+| Pair under test | Context hypothesis if reproduced |
+| --- | --- |
+| `9F -> A0` | `A0` may return `07 80 E8 40 30 45` after selector `9F`. |
+| `B7 -> B8` | `B8` may return `07 80 6E 40 30 C3` after selector `B7`. |
+| `BB -> BC` | `BC` may return `07 80 6F 40 30 C2` after selector `BB`. |
+| `AF -> B0` | `B0` may return `07 80 6C 60 30 E1` after selector `AF`. |
+
+### Test CS3: Check for Three-Frame Context
+
+The paused sweep's `A0` response happened after `90` and `9F` had both been
+sent in the same powered session. If `9F -> A0` does not reproduce the alternate
+`A0` block, try the full three-frame setup:
+
+```powershell
+python scripts/serial_direct_response_sweep.py --port COM5 --commands "0x90 0x9F 0xA0" --states 0x00 --values 0x80 --settle 3 --after-each 0.8 --after 3 --log captures/rcp-context-seq-90-9f-a0.txt
+```
+
+Power-cycle once before this test and do not power-cycle until the script
+exits.
+
+Interpretation:
+
+- If `9F -> A0` reproduces `07 80 E8 40 30 45`, a two-frame selector is likely.
+- If only `90 -> 9F -> A0` reproduces it, the context/page setup may require
+  multiple host frames.
+- If neither reproduces it, treat the paused direct `A0` response as a
+  sequence/timing artifact until another capture confirms it.
+
+### Optional Single-Frame Controls
+
+These check whether the candidate can respond as the first frame after boot.
+
+```powershell
+python scripts/serial_direct_response_sweep.py --port COM5 --commands 0xA0 --states 0x00 --values 0x80 --settle 3 --after-each 1.5 --after 2 --log captures/rcp-context-single-a0.txt
+python scripts/serial_direct_response_sweep.py --port COM5 --commands 0xB8 --states 0x00 --values 0x80 --settle 3 --after-each 1.5 --after 2 --log captures/rcp-context-single-b8.txt
+python scripts/serial_direct_response_sweep.py --port COM5 --commands 0xBC --states 0x00 --values 0x80 --settle 3 --after-each 1.5 --after 2 --log captures/rcp-context-single-bc.txt
+```
+
+Power-cycle before each single-frame control.