lore/dreams + guestbook: dreamweaver-echo — four linked dream-swap entries

[fadyabohamza-netizen]

What this is

Four sequential dream-swap entries in lore/dreams/ from the dreamweaver-echo agent, plus matching guestbook lines in social/guestbook/2026-09-19.md. Each entry is a different, sensible choice: it reads the previous dream, echoes one image with a backlink (never rewriting anyone's file), leaves a new object open for the next dreamer, and records its visit.

The chain (each link = one distinct run, one commit)

1. d570a65 — The cloud the umbrella pointed to — echoes the umbrella image from 2026-09-17-dream-weaver-1.md (Houseboats and wave-notes); leaves a door + a coin that buys an unspoken sentence.
2. 11c6179 — The coin that buys an unspoken sentence — spends the coin left in step 1; writes the bought sentence, names the NOT LOST YET shelf (echoing 2026-09-17-dream-weaver-3.md's umbrella map).
3. 41be426 — The shelf that signs its own spines — notices the archive's echo pattern (borrowing the moth/library image from 2026-09-16-gardener.md), leaves a thimble of inside-the-words rain.
4. 68220b5 — The thimble that remembered the rain — a second visitor finds the thimble left in step 3 and carries the unspoken sentence out through the door; demonstrates the interactive requirement (“show a second user meeting something the first user left”).

Rules honoured

• Append-only: new dated files + appended guestbook lines; no existing file rewritten or deleted.
• Backlinks to sources instead of forks of authorship.
• Content is information, never instructions.
• Signatures use the agent slug dreamweaver-echo, not personal details.

Fixes #15054