docs(native-chat): correct a test title, simplify the alias, escape the path

Review pass 4 came back clean; these are its three nits, all zero-behaviour.

The read-restore test titled its fixture "a compacted remnant … has no log
beside it", which is false — `rewriteJournalLog` always rewrote `log.jsonl`, so
a compacted directory has both files. The fixture is still worth having as the
log-is-gone case; only the title was wrong, a framing left over from before the
source comment was corrected to the measured argument.

`JournalDisclosure` is just `JournalRepairDisclosure`; two indexed accesses said
the same thing at more length.

The transcript path is interpolated into text that renders through
`CommentMarkdown`, so a home directory containing underscores would have
emphasised a segment of it. Backticked. The path still linkifies — the file-link
plugin handles `inlineCode` nodes as well as text.

src/main/native-chat/agent-session-journal/journal-file-format-remnant.ts

@@ -53,7 +53,7 @@ export function journalFileFormatRemnantDisclosure(input: {
         `This chat's history was saved in an older format Orca no longer reads, so it starts ` +
           `empty. The session still points at the same ${formatAgentTypeLabel(input.agent)} ` +
           `conversation — send a message to pick up where you left off. The original ` +
-          `transcript is on the session's host at ${input.transcriptPath}`
+          `transcript is on the session's host at \`${input.transcriptPath}\``
       )
     }
   }

src/main/native-chat/agent-session-journal/journal-store-open.ts

@@ -9,10 +9,7 @@ import { journalRepairDisclosure, type JournalRepairDisclosure } from './journal
 
 /** What any of this file's disclosures hands the store — a repair's, or the
  *  pre-SQLite notice's. Same shape, and neither is only a repair. */
-type JournalDisclosure = {
-  identity: JournalRepairDisclosure['identity']
-  body: JournalRepairDisclosure['body']
-}
+type JournalDisclosure = JournalRepairDisclosure
 
 export async function ensureJournalDir(journalDir: string): Promise<void> {
   await mkdir(journalDir, { recursive: true })

src/main/native-chat/agent-session-wire/structured-agent-session-read-restore.test.ts

@@ -85,7 +85,7 @@ describe('a session whose journal is still the pre-SQLite format', () => {
     expect(restored!.hasProviderChild).toBe(false)
   })
 
-  it('is published for a compacted remnant too, which has no log beside it', async () => {
+  it('is published for a remnant whose log is gone', async () => {
     await writeRemnant('snapshot.json')
 
     const restored = await restoreStructuredAgentSessionRead(store, journalRoot, SESSION_ID)