docs(changelog): document the real bot features (FR-482)

[Avicennasis]

Closes #48957. Adds a 1.0.0 entry describing the Twitch and Wikimedia bots, their command sets, the shared dotenv loader, and the pytest/ruff gates.

[Avicennasis]

This entry invents release history and backdates changes that are not on main:

• There is no v1.0.0 tag or release; the only GitHub release is an unpublished v0.0.1 draft, while the CLI reports AvicBotChat 2026.02.
• The shared dotenv loader is currently open in #31, and Wikimedia TLS is currently open in #33, so neither can truthfully appear as shipped in a July 2 v1.0.0 section.
• Initial project scaffolding remains under [Unreleased] even though the actual project began February 12.

Please establish the canonical version/release history before backfilling. Keep unmerged #31/#33 work under [Unreleased], move historical scaffold/features to a section supported by actual version/tag evidence, and do not publish the existing draft as part of this work. All current checks and git diff --check are green; no release/deploy was performed.

[Avicennasis]

Re-review at 487945f: removed the invented/backdated 1.0.0 release. The changelog now states the evidence-backed state: no published versioned release, v0.0.1 remains a draft, and the historical CLI 2026.02 identifier is not a tag/release. All history stays under Unreleased, including the pending dotenv/TLS work. Ruff 0.15.22 gates, 40 tests, and diff checks pass locally. No release was published.