docs/program-format: document Remarks-table layout + resolution path

The previous "What we don't yet know" entry for RemarkID -> RemarkText
is now closed. Replaced the placeholder note with the actual format
(clsPrograms.ReadRemarks layout) and a Python usage example showing
how to resolve a Program's remark_id against PcaAccount.remarks.

Removed the "RemarkID -> RemarkText lookup" line from the
"what we don't yet know" list.

src/content/docs/reference/program-format.mdx

@@ -45,8 +45,35 @@ When `prog_type == REMARK` (4) the bytes at offsets 1-4 hold a single
 | 1-4 | `remark_id` | BE u32 |
 | 5-13 | (unused, typically zero) | bytes |
 
-The lookup from `remark_id` to the user-visible remark string lives in a
-separate table on disk that we have not yet reverse-engineered.
+The lookup from `remark_id` to the user-visible remark text lives in a
+separate **Remarks table** further down the `.pca` body. Layout
+(`clsPrograms.ReadRemarks`, clsPrograms.cs:148-168):
+
+```
+[u32 LE _RemarksNextID]
+[u32 LE count]
+[ for each entry:
+    [u32 LE remark_id]
+    [u16 LE text_length][text_length bytes UTF-8]
+]
+```
+
+To reach the Remarks table from end-of-Connection, the walker skips
+nine fixed-shape Description blocks (one per object family, each
+`[u32 count] + count × 33 bytes`); see
+`clsHAC.cs:8055-8079`. The Python parser puts the resolved dict on
+`PcaAccount.remarks`:
+
+```python
+from omni_pca.pca_file import parse_pca_file, KEY_EXPORT
+from omni_pca.programs import ProgramType, iter_defined
+
+acct = parse_pca_file("Account.pca", key=KEY_EXPORT)
+for p in iter_defined(acct.programs):
+    if p.prog_type == ProgramType.REMARK:
+        text = acct.remarks.get(p.remark_id, "<unresolved>")
+        print(f"slot {p.slot}: remark {p.remark_id} = {text!r}")
+```
 
 ## Enums
 
@@ -208,9 +235,6 @@ pass. So is the multi-record clausal encoding hinted at by the
   the `WHEN / AT / EVERY / AND / OR / THEN` ProgType values — so we
   can't yet say whether they reference adjacent slots, use extra bytes
   within a single slot, or live in some separate clause table.
-- **RemarkID → RemarkText lookup.** The remark-text table on disk has
-  not been located; `RemarkID` decoded fine, but we can't resolve it
-  to a string today.
 - **`DoubleProgramConditional` capability flag.** We hardcode 14-byte
   records for the Omni Pro II. Other models may use the 12-byte form.
   Locating where the panel advertises the flag (and which non-OPII