changelog: add release notes for v0.20260320.0 through v0.20260721.0

[berendt]

Backfill CHANGELOG.md with entries for seven releases spanning
2026-03-20 to 2026-07-21. Highlights include SONiC config generation
and ownership hardening (breakout/ACL fixes, YANG-based validation
replaced with generated Pydantic schemas), broadened unit/integration
test coverage across conductor, tasks, API and utils modules, several
CLI exit-code and error-handling fixes, removal of the "-ng" role
variants, and a large batch of routine dependency bumps.

Generated with generate-changelog-input.sh using claude-sonnet-5.

[sourcery-ai]

Hey - I've found 1 issue

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path="CHANGELOG.md" line_range="298-299" />
<code_context>
+## [v0.20260320.0] - 2026-03-20
+
+### Added
+- Static default route in management VRF and syslog server configuration for SONiC device configs (osism/python-osism#2010)
 - Log file command for realtime log tailing from nodes via SSH, with clush support for inventory groups and path traversal prevention (osism/python-osism#2148)

+### Changed
</code_context>
<issue_to_address>
**nitpick (typo):** Use the standard spelling “real-time” instead of “realtime”.

This phrase appears in the log file command description: “realtime log tailing”. Please update it to “real-time log tailing” to align with standard technical usage.

Suggested implementation:

```
- Log file command for real-time log tailing from nodes via SSH, with clush support for inventory groups and path traversal prevention (osism/python-osism#2148)

```

Search the rest of CHANGELOG.md (and any related documentation such as README or CLI help text) for other occurrences of "realtime" and update them to "real-time" to keep terminology consistent across the project.
</issue_to_address>

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