feat(deps): add hindsight-client as optional dependency

[alt-glitch]

Summary

Declares hindsight-client as an optional dependency group [hindsight] in pyproject.toml, allowing build-time inclusion for environments where runtime pip install fails (NixOS sealed venvs, Docker, Kubernetes).

Not included in [all] — memory providers are plugins and should be opted into explicitly. Same pattern should apply to other memory providers (mem0, supermemory, etc.) if they need this treatment.

Install

# pip/uv users
uv sync --extra hindsight
pip install hermes-agent[hindsight]

# Docker/k8s
FROM nousresearch/hermes-agent:latest
RUN pip install hermes-agent[hindsight]

# NixOS (requires #21817 for extraDependencyGroups)
services.hermes-agent.extraDependencyGroups = [ "hindsight" ];

Changes

• pyproject.toml: Added hindsight = ["hindsight-client>=0.4.22"] to optional dependencies
• uv.lock: Regenerated to include hindsight-client v0.5.6

Closes #8873

[github-actions]

🔎 Lint report: feat/hindsight-optional-dep vs origin/main

ruff

Total: 0 on HEAD, 0 on base (➖ 0)

🆕 New issues: none

✅ Fixed issues: none

Unchanged: 0 pre-existing issues carried over.

ty (type checker)

Total: 8157 on HEAD, 8157 on base (➖ 0)

🆕 New issues (3):

Rule	Count
invalid-argument-type	3

First entries

run_agent.py:7160: [invalid-argument-type] invalid-argument-type: Argument to function `build_anthropic_client` is incorrect: Expected `str`, found `str | dict[Unknown, Unknown] | Any | ... omitted 3 union elements`
run_agent.py:13312: [invalid-argument-type] invalid-argument-type: Argument to function `_is_oauth_token` is incorrect: Expected `str`, found `str | dict[Unknown, Unknown] | Any | ... omitted 3 union elements`
run_agent.py:13315: [invalid-argument-type] invalid-argument-type: Argument to function `len` is incorrect: Expected `Sized`, found `(str & ~AlwaysFalsy) | (dict[Unknown, Unknown] & ~AlwaysFalsy) | (Any & ~AlwaysFalsy) | ... omitted 3 union elements`

✅ Fixed issues (3):

Rule	Count
invalid-argument-type	3

First entries

run_agent.py:13315: [invalid-argument-type] invalid-argument-type: Argument to function `len` is incorrect: Expected `Sized`, found `(str & ~AlwaysFalsy) | (dict[Unknown | str, Unknown | str | dict[str, str]] & ~AlwaysFalsy) | (Any & ~AlwaysFalsy) | ... omitted 3 union elements`
run_agent.py:7160: [invalid-argument-type] invalid-argument-type: Argument to function `build_anthropic_client` is incorrect: Expected `str`, found `str | dict[Unknown | str, Unknown | str | dict[str, str]] | Any | ... omitted 3 union elements`
run_agent.py:13312: [invalid-argument-type] invalid-argument-type: Argument to function `_is_oauth_token` is incorrect: Expected `str`, found `str | dict[Unknown | str, Unknown | str | dict[str, str]] | Any | ... omitted 3 union elements`

Unchanged: 4284 pre-existing issues carried over.

Diagnostics are surfaced as warnings — this check never fails the build.

[alt-glitch]

@jbotwell thank you for approving! apologies for the delay.