Publish Troubleshooting documentation

Troubleshooting.md

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+# Troubleshooting
+
+## `hop: command not found`
+
+Open a new terminal after installation. Confirm the install directory is on
+PATH:
+
+```bash
+command -v hop
+printf '%s\n' "$PATH"
+```
+
+The default Unix location is `~/.local/bin`. On Windows it is
+`%LOCALAPPDATA%\Programs\Hop`.
+
+## Codex does not activate Hop
+
+```bash
+hop skill install --force
+```
+
+Restart Codex Desktop. Mention `$hop` in a task as a deterministic activation
+fallback.
+
+## The installer cannot find a release
+
+Only published Gitea Releases appear through the public releases API. Drafts
+and an instance that is not live will return an error; published prereleases
+are supported. Pin an existing tag with `HOP_VERSION`, or use the source build
+until the first release is published.
+
+## Git is too old
+
+Hop requires Git 2.40 or newer for structured, explicit-base `merge-tree`
+behavior:
+
+```bash
+git --version
+```
+
+Upgrade Git through the operating system package manager before retrying.
+
+## Exit code 20: merge conflict
+
+The agent should adopt the returned reconciliation prompt and workspace,
+resolve both intents, run `hop check`, propose, and land again. Users should not
+need to perform ordinary source merges.
+
+## Exit code 22: validation failed
+
+The accepted head did not advance. Inspect the recorded output, fix the attempt
+workspace, and rerun the check.
+
+## Exit code 23 or `Root: diverged`
+
+Hop found visible files or index state it will not overwrite. Preserve those
+changes. Capture them as a new Hop task or resolve them intentionally, then
+retry `hop land`. Do not bypass this with `hop accept` in Desktop workflows.
+
+## Internal ref or object warning
+
+```bash
+hop doctor
+```
+
+If SQLite is healthy and the report specifically identifies derived refs:
+
+```bash
+hop doctor --repair
+```
+
+Do not repair while a final validation command is running.
+
+## A secret was pasted
+
+Rotate it. Hop redaction reduces durable exposure but cannot prove that every
+credential format, attachment, agent log, or external system omitted the value.