Replace SSH tutorial in README with wiki pages by OS

Linux, macOS, Windows SSH setup guides moved to wiki. README becomes index with wiki links and breadcrumb to existing docs.

wiki/SSH-Setup-Linux.md

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+# SSH Setup — Linux
+
+## Generate an SSH key
+Open a terminal and run:
+```bash
+ssh-keygen -t ed25519 -C "your-name@example.com"
+```
+Press Enter to accept the default path `/home/<you>/.ssh/id_ed25519`. Use a passphrase for extra safety.
+
+## Add the public key to Gitea
+```bash
+cat ~/.ssh/id_ed25519.pub
+```
+Copy the full output, then open `http://git.klud.top/user/settings/keys` in your browser and paste it. Title: `linux-<yourname>`.
+
+## Accept the server fingerprint and test
+```bash
+ssh -T git@thunderobot -p 222
+```
+- If asked `Are you sure you want to continue connecting (yes/no/[fingerprint])?`, type `yes`.
+- Expected output: `Hi there, <yourname>! You've successfully authenticated with the key named linux-<yourname>, but Gitea does not provide shell access.`
+
+## Clone a repo
+```bash
+git clone git@thunderobot:222/danchie/tekton.git
+```
+Or with tea:
+```bash
+tea repos clone --git-protocol ssh danchie/tekton
+```
+
+## Troubleshooting
+- **`Permission denied (publickey)`** — Your key wasn't added in the Gitea UI, or the agent hasn't loaded it. Run `ssh-add ~/.ssh/id_ed25519`.
+- **`Host key verification failed`** — Run the `ssh -T` command above interactively at least once.
+- **`ssh: connect to host thunderobot port 222: Connection refused`** — Ensure Tailscale is running and you can reach `100.93.226.13`.
+- **`ssh: Could not resolve hostname thunderobot`** — Run `tailscale ping thunderobot` to verify tailnet DNS works. If not, use `ssh -T git@100.93.226.13 -p 222` instead.

wiki/SSH-Setup-Windows.md

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+# SSH Setup — Windows
+
+## Install Git for Windows
+Download from https://git-scm.com/download/win and install with default options.
+
+This installs `git`, `ssh`, and `git-bash`.
+
+## Generate an SSH key
+Open **Git Bash** and run:
+```bash
+ssh-keygen -t ed25519 -C "your-name@example.com"
+```
+Press Enter to accept the default path `C:\Users\<you>\.ssh\id_ed25519`. Set a passphrase, or leave it empty.
+
+## Add the public key to Gitea
+```bash
+cat ~/.ssh/id_ed25519.pub
+```
+Copy the full output, then open `http://git.klud.top/user/settings/keys` in your browser and paste it. Title: `windows-<yourname>`.
+
+## Accept the server fingerprint and test
+```bash
+ssh -T git@thunderobot -p 222
+```
+- If asked `Are you sure you want to continue connecting (yes/no/[fingerprint])?`, type `yes`.
+- Expected output: `Hi there, <yourname>! You've successfully authenticated with the key named windows-<yourname>, but Gitea does not provide shell access.`
+
+If you get this message, the key is recognized.
+
+## Clone a repo
+```bash
+git clone git@thunderobot:222/danchie/tekton.git
+```
+Or with tea:
+```bash
+tea repos clone --git-protocol ssh danchie/tekton
+```
+
+## Troubleshooting
+- **`Permission denied (publickey)`** — Your key wasn't added in the Gitea UI, or `~/.ssh/id_ed25519` isn't being offered. Run `ssh-add ~/.ssh/id_ed25519` in Git Bash.
+- **`Host key verification failed`** — Run the `ssh -T` command above interactively at least once.
+- **`ssh: connect to host thunderobot port 222: Connection refused`** — Ensure you can reach the tailnet host: `ping 100.93.226.13`. If ping fails, your machine isn't on the tailnet.

wiki/SSH-Setup-macOS.md

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+# SSH Setup — macOS
+
+## Generate an SSH key
+Open **Terminal** and run:
+```bash
+ssh-keygen -t ed25519 -C "your-name@example.com"
+```
+Press Enter to accept the default path `/Users/<you>/.ssh/id_ed25519`. Use a passphrase for extra safety.
+
+## Add the public key to Gitea
+```bash
+cat ~/.ssh/id_ed25519.pub
+```
+Copy the full output, then open `http://git.klud.top/user/settings/keys` in your browser and paste it. Title: `macos-<yourname>`.
+
+## Accept the server fingerprint and test
+```bash
+ssh -T git@thunderobot -p 222
+```
+- If asked `Are you sure you want to continue connecting (yes/no/[fingerprint])?`, type `yes`.
+- Expected output: `Hi there, <yourname>! You've successfully authenticated with the key named macos-<yourname>, but Gitea does not provide shell access.`
+
+## Clone a repo
+```bash
+git clone git@thunderobot:222/danchie/tekton.git
+```
+Or with tea:
+```bash
+tea repos clone --git-protocol ssh danchie/tekton
+```
+
+## Troubleshooting
+- **`Permission denied (publickey)`** — Your key wasn't added in the Gitea UI, or the key isn't loaded in the agent. Run `ssh-add ~/.ssh/id_ed25519`.
+- **`Host key verification failed`** — Run the `ssh -T` command above interactively at least once.
+- **`ssh: connect to host thunderobot port 222: Connection refused`** — Ensure Tailscale is running and you can reach `100.93.226.13`.