chore: rename MemorySidecar to mindD

[mkorbi]

Renames the project from MemorySidecar to mindD, aligning it with its siblings (vibeD, hiveD, routeD).

Naming follows the sibling convention: mindD in prose, mindd in identifiers. hiveD's README already refers to "mindD" as its memory layer, so the name was pre-planned.

Name mapping

Layer	Before	After
Go module	memsidecar	github.com/vibed-project/mindD
proto package	memsidecar.<block>.v1	mindd.<block>.v1
proto/gen dirs	proto/memsidecar, gen/memsidecar	proto/mindd, gen/mindd
daemon	cmd/memsidecar	cmd/mindd
CLI	memctl	mindctl
wire header	x-memsidecar-capability	x-mindd-capability
env prefix	MEMSIDECAR_*	MINDD_*
npm	@memsidecar/client	@mindd/client
PyPI	memsidecar	mindd
Python class	MemSidecar	MindD
Helm chart / image	deploy/helm/memsidecar	deploy/helm/mindd

251 files changed, +3967/-3967 — insertions exactly equal deletions, as expected for a pure rename.

Compatibility

The gRPC package rename is wire-breaking. This is the free moment to do it:

• There are no git tags in the repo, so the tag-triggered SDK release workflows (python-sdk-v*, typescript-sdk-v*) have never fired — nothing is published to npm or PyPI.
• No external consumers.
• The capability header changed in lockstep across the server, both SDKs and mindctl, so there is no mixed-version window within the repo.

Two traps worth calling out

• Protobuf stubs were regenerated, not text-substituted. The .pb.go raw descriptors embed length-prefixed package strings (e.g. Z*github.com/..., where * is byte 0x2a = 42). A sed sweep corrupts the prefix. All three stub sets (Go, Python, TypeScript) were regenerated with buf; the prefix is now correctly Z3 (51 chars) for the new path.
• Markdown code fences can nest inside blockquotes (> ```bash). The prose-branding pass initially rewrote pip install memsidecar into a broken pip install mindD; the fence detector was fixed to honour the > prefix before applying. Identifiers inside code spans and fences are untouched.

Verification

All run against the renamed tree:

• buf lint clean
• go build ./..., go vet ./... clean
• go test -race ./... — all pass
• golangci-lint run — 0 issues
• tsc --noEmit clean; 10/10 TypeScript tests pass
• from mindd import MindD imports
• helm lint + helm template OK
• docker compose config valid
• Docusaurus build succeeds with no broken-link warnings (note: onBrokenLinks is warn, so links are reported but not gated)
• Live end-to-end round-trip: server boots on configs/example.yaml → mindctl token issue → kv put / kv get returned world-from-mindd

Follow-ups (not in this PR)

• Rename the GitHub repo vibed-project/MemorySidecar → mindD. The remote was deliberately left on the old URL, which keeps working (GitHub redirects old→new after a rename).
• hiveD has 25 stale references — docs, MEMSIDECAR_* in deploy/compose/docker-compose.yaml, and ADR-0004's memsidecar/gen/... import paths. No Go code dependency; separate repo.
• The docs site url: is now https://mindd.dev — worth confirming that domain is controlled.
• The encryption-at-rest work has been re-applied on top of this rename (stacked branch, applies with zero conflicts, tests pass) and can follow as its own PR.

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