feat(track): add --wait to block until the repo is indexed

[zzet]

What

Adds --wait (and --wait-timeout) to gortex track:

gortex track --wait .            # block until the repo is indexed + queryable
gortex track --wait --wait-timeout 5m .

gortex track hands the repo to the daemon and returns immediately — indexing runs asynchronously — so a following gortex analyze / query can race ahead of the graph being ready. --wait blocks until indexing settles, then returns.

Why

The one-shot / CI pattern ("index this path, then analyze it, in one job") currently needs an inline poll loop in every workflow:

gortex track .
for i in $(seq 1 60); do gortex status | grep -qE '[1-9][0-9]* nodes' && break; sleep 2; done
gortex analyze --kind synthesizers --format json

With this flag that collapses to:

gortex track --wait .
gortex analyze --kind synthesizers --format json

Settle semantics

--wait polls the daemon (reusing the same ControlStatus the status command uses) until the tracked repo is present with a non-zero node count that has stopped moving (stable across two consecutive polls) and the daemon reports a resolved, queryable graph (Ready). The per-repo stable-count check is what makes this hold on a warm multi-repo daemon, where the daemon-global Ready flag alone wouldn't tell you this repo finished.

• --wait-timeout (default 10m, 0 = wait forever) bounds it so CI can't hang.
• With --wait, a missing/unavailable daemon is an error (the flag promised a queryable graph it can't deliver) rather than the normal offline-safe soft success.

The classifier and poll loop are pure/seam-injected, so the tests exercise them without a running daemon (stubbed status fn + sub-ms poll interval).

Scope

• cmd/gortex/track.go only (+ tests). No protocol/daemon change — Ready and per-repo node counts already ride on StatusResponse.
• Pairs with refactor(analyzer): extract synthesizers + resolution_outcomes into pure cores #169 (analyzer cores + CI recipe): once this lands, that recipe simplifies to the two-line form above.

go build ./..., go vet, golangci-lint clean; go test ./cmd/gortex/ passes (531).

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