Add CLAUDE.md, project memory notes, and token_count

CLAUDE.md points future sessions at .claude/memory/ for accumulated
project context (purpose, SA/MR topology, packaging/signing decisions,
open external dependencies) not fully captured elsewhere in the repo.

.claude/memory/project-purpose.md

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+# Project Purpose
+
+This repo is about improving NiFi workflows in two related ways:
+
+1. **Performance** — the current pack/unpack path (`MergeContent` /
+   `UnpackContent`) is disk-I/O bound on shared vSAN storage, due to
+   redundant read/write passes: an ingest write, a separate read to hash
+   content, a read+write to merge/pack, a read+write to unpack. vSAN is
+   shared, virtualized IOPS across the vSphere cluster, so the pain is
+   *contention*, not any single slow disk.
+2. **Integrity & non-repudiation** — FlowFiles packed and exported outside
+   NiFi's space need signed attributes (the attributes already carry a
+   content hash, so content isn't re-hashed at pack time) to prove both
+   integrity and authorship, for S3 storage/retrieval, HTTP/filesystem
+   delivery, and selective date/category replay from a catalog database.
+
+A future requirement extends this to TB-scale files that must be chunked,
+tracked, and transited through NiFi (for routing/content-assurance
+controls — all content must pass through NiFi) — including across a
+one-way network boundary (MR) with no return channel for retransmission.
+
+See [[topology]] and [[packaging-signing-decisions]].