Migrate Festipod onto the rebuilt @ng-eventually/client surface

The SDK was rebuilt: reading is possession instead of an ACL, `Nuri` and
`ReadCap` are template literal types, the cross-account fan-out is gone, and so
is the global discovery index.

Repair the typecheck gate FIRST — it was checking nothing. Under TypeScript 6 the
deprecated `baseUrl` is reported as an ERROR that aborts compilation, so
`tsc --noEmit` exited 0 having verified nothing, behind a single line that reads
like a harmless warning. Dropping `baseUrl` (paths resolve relative to the file
since 4.4) makes the gate real again — and it immediately surfaced 33 errors,
three of which had been dormant for a long time.

Types: 18 sites fixed AT THE SOURCE — the functions that produce a NURI now
return `Nuri` — with `isNuri` guards only at genuine boundaries (an `@id` read
back from a document, an argument coming from a Cucumber step). No cast, no
`@ts-ignore`: silencing the compiler here would have removed the very guarantee
the new types provide.

Capabilities: the ACL is gone. `grantRead`/`protectedDocsOf`/`canRead`/
`makePublic` give way to `capFor`/`shareCap`/`publishRepoLink`, and `open` loses
its `owner` argument. `declareConnections` now shares the caps of its OWN
protected documents to each neighbour's wallet inbox.

Discovery is REMOVED, not postponed: there is no discovery in the target model,
a reader reaches a document only by following a link it was given. The module and
its call sites are gone; the scenario is suspended with a comment saying what
will bring it back — a Festipod DIRECTORY document, whose link the app knows.
Kept rather than deleted: the product need has not gone away.

Verification, and a correction to how it was measured. The @data baseline (20/22)
had been taken on a bloated test wallet: 93 MB against a threshold documented
around 99 MB, with the run stretching from 18 to 23 minutes. Restarting from a
fresh profile drops it to 9m37 and turns BOTH baseline failures green — including
the cold-reconnection one, which confirms the SDK's claim that a fresh session
reads its own documents back with nothing re-declared. So the reference itself was
degraded, on both sides of the comparison.

Real state: typecheck 0, @ui 7/7, @data 20/21. The single failure is understood
and left standing: the protected-connections probe reads the protected STORE
document as a stand-in for an entity. Sharing a store cap would hand over its
entire contents, present and future — precisely the gesture the model refuses. The
scenario's own title says "the protected ENTITY"; the probe is what took the
shortcut, and it is what has to change.

.project/concepts/tech-stack/_debt.md

@@ -0,0 +1,7 @@
+# Doc-debt — tech-stack
+
+> Presence of a block = doc to update. Processed → delete the block; no blocks left → delete this file.
+> One block = one "big change": `why` + `files` + `verify` (leaves to review).
+
+## Raw markers (consolidate into blocks, then delete)
+- TOUCHED tsconfig.json @2026-08-03 (session 0b064e8b-1717-421f-a20e-a4318ad217b1)