📚 docs: (installation) replace the seed step with tapesctl sync

[bdougie]

Why

The quick start went from tapes serve to tapesctl seed, so the first thing a new user saw was demo data. Anyone installing Tapes already has Claude Code sessions on disk. If they do not, they are probably not the target user. tapesctl sync pushes those sessions in, and it was only documented on the tapesctl capture page.

What changed

In docs/installation.md, the seed step is replaced with a sync step:

• tapesctl sync --ingest-url http://localhost:8082 then tapesctl sessions list.
• Notes that it is safe to repeat, that derivation runs in the background, and that --since-days 0 sweeps everything.
• Links to the capture page for what a transcript-only session contains.

tapesctl seed still exists and is still documented on the commands page. It is no longer the first thing a new user is told to run.

Docs only. Renders at https://tapes.dev/docs/installation/ once synced.

Part of PCC-1305

[greptile-apps]

Greptile Summary

Adds a quick-start section explaining how to import existing Claude Code transcripts with tapesctl sync.

• Shows the sync and session-list commands.
• Documents the default seven-day window, repeat safety, asynchronous derivation, and full-history option.
• Links readers to the detailed capture documentation.

Confidence Score: 5/5

The documentation-only change appears safe to merge.

The documented ingestion deduplication, asynchronous derivation, and local read-versus-ingest port behavior align with the repository’s current contracts, and no concrete broken workflow was established.

Important Files Changed

Filename	Overview
docs/installation.md	Adds concise installation guidance for syncing existing Claude Code sessions; no actionable issue was established.

_{Reviews (1): Last reviewed commit: "📚 docs: (installation) show tapesctl sy..." | Re-trigger Greptile}

[linear-code]

PCC-1305